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?

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