Question

A shopkeeper bought 150 books and sold 100 of them at a profit of 30% and the rest at 10% loss.If he had sold all the books at once at 25% profit, he would have received Rs. 300 more.Find the cost price of each book

Answer 1

Answer:

$\div 30 = 3 \\ \\ 25 \times 3 = 75 \\ 75 \div 300 = 4$