Selling an kite for Rs. 30, a shop keeper gains 35%. During a clearance sale, the shopkeeper allows a discount of 10% on the marked price. His gain percent during the sale is? Choose the correct option
A) 8%
B) 10%
C) 11%
D) 15%
E) 21.5%
Explanation:   Marked price = Rs. 30   C.P. = 100/135 * 30 = Rs. 22.22   Sale price = 90% of Rs. 30 = Rs. 27   Required gain % = 4.77/22.22 * 100 =21.5%.   Answer: 21.5%
<result>E</result>
Selling an kite for Rs. 30, a shop keeper gains 35%. During a clearance sale, the shopkeeper allows a discount of 10% on the marked price. His gain percent during the sale is?