The marked price of a radio is Rs 480. The owner allows a discount of 10% and still earns the profit of 8%. If no discount is allowed, find his gain percent?

20%

Market Price = 480

Selling price after discount of 10% = 480 - 10% of 480 = 432

Cost price (considering profit 8%) = \(\frac{ 432}{ 108}\) * 100 = 400

Now, 

MP = 480

CP = 400 

Gain % = \(\frac{\text{480 - 400} }{400 }\) * 100

Gain % = \(\frac{\text{80} }{400 }\) * 100

Gain % = 20%