Current location - Training Enrollment Network - Mathematics courses - Math problem A box of biscuits with a price of 18 yuan can earn 20% of the original price if sold at a 20% discount. What's the purchase price of this box of biscuits?
Math problem A box of biscuits with a price of 18 yuan can earn 20% of the original price if sold at a 20% discount. What's the purchase price of this box of biscuits?
18×80%÷( 1+20%)

= 18×0.8÷ 1.2

= 14.4÷ 1.2

= 12 (yuan)

A: The purchase price of this box of moon cakes is 12 yuan.

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