Question

一件上衣按（百分之30）的利润定价销售，后打八五折促销仍获取利12.6元，这件上衣进价为（）元 方

程要很详细

Answer 1

设这件上衣进价为 x

x ( 1+ 30% ) x 85% = x + 12.6
x = 12.6 ÷ [ ( 1+ 30% ) x 85% -1 ]
= 12.6 ÷ ( 1.105 - 1 )
= 12.6 ÷ 0.105
= 120

追问

x = 12.6 ÷ [ ( 1+ 30% ) x 85% -1 ] 这一步？

追答

x ( 1+ 30% ) x 85% = x + 12.6

x ( 1+ 30% ) x 85% - x = 12.6

x [ ( 1+ 30% ) x 85% -1 ] = 12.6

x = 12.6 ÷ [ ( 1+ 30% ) x 85% -1 ]