By selling an umbrella for Rs. 300, a shop keeper gains 100%. 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 choice from the following choices:
A) 23.23  B) 32.32  C) 33.33  D) 30  E) 31
Marked price = Rs. 200   C.P. = 100/100 * 300 = Rs. 300   Sale price = 90% of Rs. 300 = Rs. 270   Required gain % = 100/300 * 100 = 33.33%.   Answer:33.33
<result>C</result>
By selling an umbrella for Rs. 300, a shop keeper gains 100%. During a clearance sale, the shopkeeper allows a discount of 10% on the marked price. His gain percent during the sale is?