By selling an umbrella for Rs. 300, a shopkeeper gains 20%. During a clearance sale, the shopkeeper alows a discount of 10% on the marked price. His gain percent during the sale is : Choose the correct option.
A) 6	B) 7	C) 8	D) 9	E) 10
Sol.   Marked price = Rs. 300. C.P. = Rs. [100 / 120 * 300] = Rs.250.   Sale price = 90% of Rs. 300 = Rs. 270.   ∴ Required gain% = [20 / 250 * 100= 
<gadget id="calculator">20 / 250 * 100</gadget>
<output>8</output>
8%.   Answer 8
<result>C</result>
By selling an umbrella for Rs. 300, a shopkeeper gains 20%. During a clearance sale, the shopkeeper alows a discount of 10% on the marked price. His gain percent during the sale is :