Do the students have their own savings? I brought you math diary 300 words about savings, hoping to help you.
Chapter 1: math diary's 300-word questions about savings are as follows: A and B each have a deposit. Now Party A and Party B each withdraw 20% of the deposit. At this time, Party A's remaining deposit is less than Party B's by 400 yuan, so it can be known that the total amount in their passbook at this time is14,800 yuan. How many deposits do Party A and Party B have? (Interest is not considered). The difficulty of this problem lies in knowing only the total amount of money left, and asking how much money the original two people had respectively.
This question stumped me. I've racked my brains and I can't figure it out. I have no choice but to ask my mother. Mother looked at the problem carefully, thought about it and said that this problem can be solved by a binary linear equation. Suppose A's deposit originally had X yuan, and B's deposit originally had Y yuan. ? I was told to work out the equation by myself. After careful consideration, I finally listed a formula:
X (1-20%)+y (1-20%) =14800. I really can't figure out what to do next, so I have to turn to my mother again. Mom said to me:? Binary equation needs two equations to solve the answer. You need to make another equation, and then convert the two equations into one equation, and you can work it out. Just try it. ? I read the problem over and over again and came up with the second equation. X (1-20%)+400 = y (1-20%). Seeing this formula, I suddenly understood the meaning of my mother's sentence. I changed the second equation to
X (1-20%) = y (1-20%)-400 is substituted into the first equation and the third equation is calculated: y (1-20%)-400+y (1-20%). 0.8-400)? 0.8=9000 yuan.
Math diary 300 words about saving I have a bear piggy bank with many small coins, including 1 cent, 50 cents and 1 yuan. Now the bear's stomach is full, and it can hardly hold on. One night, my mother and I opened the bear's stomach together. Haha, all the coins are used up. I counted with my mother, and my mother asked me to count fifty cents. I carefully picked out the small 50-cent coins in the golden dress one by one. One, two, three. Wow, a ***4 1 fifty cents. I put them together first, and then counted 1 yuan coins, a * * 26 65438+. Mother asked me to count how many coins there were.
I took out my paper and wrote down 26 sheets 1 yuan, which is 26 yuan; Then I wrote down 40 50-cent pieces. I counted two 50-cent coins, which were 1 yuan, then 1 yuan, 2 yuan ... and finally, I counted 19 pieces 1 corner, and one * * was 1 yuan and 90 cents.
Finally, I added these three piles of coins together, and 26 yuan +20 yuan+1 yuan and 90 cents. One * * * is 47.9 yuan. Mom said that these coins can buy my exercise books, pencils, erasers and other stationery, and can't be squandered.
Chapter 3: math diary's 300 words about savings came to the bank. I saw a vertical poster, just below. Dad is starting to have problems. Yan Yan, I have 1000 yuan here. How much can I get back in two years? By the way, don't forget to pay taxes, because paying taxes is the obligation of every citizen. ? Dad never forgets to educate his daughter. ? Dad, you haven't told me the interest rate yet. Didn't you see the poster at the door when you came in? Ha, I forgot. Look at this memory, it's really poor, not as good as me! As far as you are concerned, I couldn't find my mobile phone last time. I called you and found it. It's up to you! ? I immediately took out a pen and paper and counted it. Dad, I calculated that the money you can get after two years is 1088.92 yuan. It seems that I did well in math this semester. Let's ask my aunt if she is right.
Before coming to the counter, my father reported the information to my aunt in the bank. My aunt told my father that I could really get back 1088.92 yuan after two years. Dad said to me:? I have made great progress in my study this semester. ? I praised Wang Po for selling melons. Of course, who is your daughter! Xie Yuyan, the daughter of Xie Jia. ?
Chapter IV: math diary 300-word savings The definition of savings is that urban and rural residents deposit temporarily unused or surplus monetary income into banks or other financial institutions, also known as savings deposits. There are many deposit methods: at present, banks have several deposit methods, such as passbook, deposit certificate (usually fixed) and bank card. And many people don't know the principal, interest and interest rate. These three words are financial terms. Principal refers to the initial capital of individuals investing in financial markets. Interest rate refers to profit rate; Interest refers to the return of financial markets! Principal? Interest rate? Time = interest, and what does after-tax interest mean? It's simple! It is the interest part of your deposit after deducting interest tax.
In China, deposit interest is subject to interest tax. What are the specific tax items in personal income tax? Income from interest, dividends and bonuses? . In 20 12 years, the deposit interest rate of Chinese people (as shown in the following figure) is 3.25% for one year, 3.75% for two years, 4.25% for three years and 4.75% for five years, as well as interest-free national debt and education savings.
Chapter 5: math diary's 300 words about savings When we walked into the industrial and commercial bank of the community, we saw the words on the electronic big screen, which showed the deposit interest rate of RMB, which was divided into five deposit methods: lump-sum deposit and withdrawal, notice deposit and current deposit. We copied the interest rates one by one in a small book.
When we get home, we can't wait to solve this problem with our mother. Our money is 3200, and the annual interest is 3200. 4. 14%= 132.48 yuan, after deducting interest tax 132.48? 0.05=6.62 yuan, and the net interest income is132.48-6.62 =125.86 yuan; The annual interest income for the biennium is 3200? 4.68%= 149.76 yuan, after deducting interest tax 149.76? 0.05=7.49 yuan, and the net interest is 142.27 yuan; Three years is 3200? 5.4%= 172.8 yuan, after deducting interest tax of 8.64 yuan, the net interest is 164. 16 yuan; Five years is 3200? 5.85%= 187.2 yuan, after deducting interest tax of 9.36 yuan, the net interest is 177.84 yuan. From the calculation results, it seems that the one-year interest income is the least, and the five-year interest income is the most. Then, we made a comparison between one year and other years. For two years, it is142.27-125.86 =16.41yuan; for three years, it is 164. 16-65438. But on second thought, the deposit time is too long, and if the bank raises interest rates, we can't withdraw it in advance, because early withdrawal can only be regarded as the current interest rate of only 0.72%. Isn't that a loss? If the one-year deposit is too short, choose between two years and three years. According to the results of income comparison, we chose three years!
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