1.

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:

Answer»

15
20
25
45

Solution :
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`


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