Teaching objectives:
1. Grasp the concepts of cost, selling price, discount, profit and profit rate in economic problems, understand relevant formulas and skillfully use them to solve related problems.
2. Master and skillfully use all kinds of mathematical ideas involved in the process of solving problems.
The basic formula of economic problems:
(1) selling price = cost+profit = cost × (profit percentage+1) = pricing × discount percentage.
(2) Pricing = cost+expected profit = cost × (expected profit percentage+1) = selling price/discount.
(3) Profit = profit percentage × cost profit percentage = profit/cost×100%.
(4) Expected profit = percentage of expected profit × cost; Expected profit percentage = expected profit/cost × 100%
Note: the cost is also the purchase price, and the pricing is equivalent to the marked price of our goods.
(5) Interest = principal × interest rate.
Reference to the above content: Baidu Encyclopedia-Economy