Question

By selling 200 books,a man gains the selling price of 80 books.find his gain percent.

Answer 1

Here question should be cost price of 80books

Cost price of one book = a

Cost price of 80 books = 80x

Selling price of 200 books = 80x

Cost price of 200 books - 200x

Gain = 200x - 80x = 120x

Gain percent = 120x/80x  x 100 = 150%