A pen is listed for ₹ 12. A discount of 15% is given on

A pen is listed for ₹ 12. A discount of 15% is given on it. A second discount is given bringing the price down to ₹ 8.16. The rate of second discount is

Let the rate of second discount be x %
After 15% discount,

Price of pen =	85	× 12 = ₹ 10.20
	100

Now, 10.20 – 8.16 = ₹ 2.04
It is second discount.

∴	x	×10.20 = 2.04
	100

⇒ 10.2x = 204

⇒ x =	204	= 20%
	10.2