Profit Loss Discount - The printed price of a book is Rs 720 . After giving 10 % discount to the customer on the printed price, the book-seller gets ... calculator

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18. The printed price of a book is Rs . After giving % discount to the customer on the printed price, the book-seller gets % profit. Find the purchase price for the book-seller.

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Profit Loss Discount

18. The printed price of a book is Rs 720 . After giving 10 % discount to the customer on the printed price, the book-seller gets 20 % profit. Find the purchase price for the book-seller.

The printed price of a book is Rs `720`.

After giving `10` % discount to the customer on the printed price

S.P. = Printed price - discount `= 100 - 10 = 90`

Printed Price

S.P.

100

90

720

?

the book-seller gets `20` % profit,

S.P. = C.P. + Profit `= 100 + 20 = 120`

S.P.

C.P.

120

100

648

?

C.P. = `100 × 648/120 = 540`

The purchase price for the book seller is Rs `540`.