stm32f030f4:think about math

来源：百度文库 编辑：高考问答 时间：2024/05/01 11:37:10
a candy dealer makes up a mixture of 3 parts of candy costing him $0.60 a pound with 2 parts of candy costing him $0.70 a pound, 2 parts of candy costing him $0.50 a pound. At what price per pound should he sell this mixture to make a profit of 25% ?

((3/7)(0.6)+(2/7)(0.7)+(2/7)(0.5))x(1+0.25)
actually i am not very sure.

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