Question

A bookseller purchased 70 pens at the rate of 3 per pen . He sold 60% of the pens at the rate of 3.50 and remaining pens at the rate of 5 per pen. Find his profit per cent .​

Answer 1

Purchasing cost= 210
Selling price= 147(42*3.5) + 140(28*5)= 287
Profit= 210-287= 77