The price of a sweater was slashed from Rs. 960 to Rs. 816 by a shopkeeper in the winter season. Find the rate of discount given by him.

Market Price = Rs.960

Selling Price = Rs.816

Discount = Market Price – Selling Price

= 960 - 816

=Rs.144

Discount % = (Discount/Market Price) × 100

= (144/960) × 100

= 15%