The school used 1800 kilowatt hours of electricity last month and 1650 kilowatt hours of electricity this month. How much has it saved this month?
(1800-1650)/1800=8.33%
The school used to use 80 kilowatt hours of electricity every day, but now it saves 20 kilowatt hours every day. How many percent?
Daily saving = 20 △ 80 × 100% = 25%
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The cost of each product in a factory is 39 yuan, which is 25% lower than the original. How much is the original cost of each product?
Answer: the original cost of each product is 52 yuan