By selling an umbrella for Rs. 500, a shop keeper gains 20%. During a clearance sale, the shopkeeper allows a discount of 10% on the marked price. His gain percent during the sale is?
Select
A) 15%  B) 12.5%  C) 18%  D) 11.11%  E) 14%
Marked price = Rs. 500   C.P. = 100/120 * 500 = Rs. 400   Sale price = 90% of Rs. 500 = Rs. 450   Required gain % = 50/400 * 100= 
<gadget id="calculator">50/400 * 100</gadget>
<output>25/2 = around 12.5</output>
12.5%.   Answer: 12.5%
<result>B</result>
By selling an umbrella for Rs. 500, a shop keeper gains 20%. During a clearance sale, the shopkeeper allows a discount of 10% on the marked price. His gain percent during the sale is?