Question

If the selling price of 16 books is equal to the cost price of 20 books, what is the profit per cent?

Answer 1

let CP of 16 books be x

cp of 20 books is 20/16 x

SP= 20/16 x

so SP - CP /Cp × 100

20/16 x - x )/ x × 100

100/4 = 25%