By selling an umbrella for Rs. 300, a shop keeper gains 200%. 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 answer
A) 50	B) 25	C) 400	D) 200	E) 150
Marked price = Rs. 300   C.P. = 100/300 * 300 = Rs. 100   Sale price = 90% of Rs. 300 = Rs. 270   Required gain % = 200/100 * 100= 
<gadget id="calculator">200/100 * 100</gadget>
<output>200</output>
200%.   Answer:200
<result>D</result>
By selling an umbrella for Rs. 300, a shop keeper gains 200%. During a clearance sale, the shopkeeper allows a discount of 10% on the marked price. His gain percent during the sale is?