Modern electronic shop sold the 30% hardware at the profit of 50% and 90% software at the profit of 10%. The average profit per cent of the Modern electronic shop os, if it sells only these two kinds of things:

Options

A. 15
B. 20
C. 25
D. 45

Answer

B

Explanation

The actual ratio is 3:1. So, the reversed ratio is 1:3.
Now divide the difference of 10 and 50 in the ratio of 1:3 then add the first part to the 10 or subtract the second part from the 50.
i.e., Required average = `10+(50-10)xx1/4`
= 10+10 = 20
or 50-(50-10)xx3/4 = 20`