Question

A man sold 100 books for rs.990 and earned a profit of rs. 90. the cost price of 100 books is​

Answer 1

Cost Price = Selling Price - Profit

                 = 990 - 90 = Rs. 900

Thus , C.P of 100 books is Rs. 900

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Answer 2

S.P of 100 books = Rs 990 .

Profit earned = Rs 90 .

∴ C.P = S.P - Profit

C.P of 100 books = Rs 990 - Rs 90

= Rs 900

ANSWER :

Rs 900 is the cost of 100 books.