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Twenty years of math problems
1. The sales of Zhong Bai Warehouse in the first quarter of this year was 2.7 million yuan, and the sales in the second quarter increased by 20% compared with the first quarter. What is the sales volume in the second quarter?

270×( 1+20%)

=270× 1.2

= 3.24 million yuan

2. During the 11th period, all the books in Xinhua Bookstore were 25% off. Why are 100,000 books 15 yuan? How much are 20 100,000 books?

15×20×85%

=300×85%

=255 yuan

3. To build a 2500-meter-long road, Team A built 40% of the total length and Team B built 36% of the total length.

Question1; How many meters did Team A repair?

2500× 40% =1000m

Question 2; How many meters did Team B repair?

2500×36%=900 meters

Question 3; How many meters did Team A repair more than Team B?

2500×(40%-36%)

=2500×4%

= 100 meter

Question 4; How many meters are left to be repaired? Every question in this problem should be calculated comprehensively.

2500×( 1-40%-36%)

=2500×24%

=600 meters

4. The original price of a book is 80 yuan, with a price increase of 25%. What's the current price?

80×( 1+25%)

=80× 1.25

= 100 yuan

A book has 240 pages, of which 20% has been read. How many pages have you missed?

240×( 1-20%)

=240×80%

= 192 page