think about math
问题描述:
think about math
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%
答
((3/7)(0.6)+(2/7)(0.7)+(2/7)(0.5))x(1+0.25)
actually i am not very sure.