The list price of a book is Rs. 100. A dealer sells three

The list price of a book is Rs. 100. A dealer sells three such books for Rs. 274.50 after allowing discount at a certain rate. Find the rate of discount.

Total marked price of three books = Rs. 300
Their S.P. = Rs. 244.50
Discount = Rs. (300 – 274.50) = Rs. 25.50
If the rate of discount be x%, then

300 × x	= 25.50
100

⇒ 300x = 25.50 × 100

⇒ x =	25.50 × 100	= 8.5%
	300

Second Method :
M.P. = Rs. 300 (for three books)
S.P. = Rs. 274.50

=		M.P. − S.P.		×100%
		M.P.

=		300 − 274.50		×100%
		300

25.50	× 100 = 8.5%
300