By selling an umbrella for Rs. 200, a shop keeper gains 50%. 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 options.
A) 20  B) 25  C) 15  D) 10  E) 5
Marked price = Rs. 200   C.P. = 100/150 * 200 = Rs. 200   Sale price = 90% of Rs. 200 = Rs. 180   Required gain % = 50/200 * 100= 
<gadget id="calculator">50/200 * 100</gadget>
<output>25</output>
25%.   Answer:25
<result>B</result>
By selling an umbrella for Rs. 200, a shop keeper gains 50%. During a clearance sale, the shopkeeper allows a discount of 10% on the marked price. His gain percent during the sale is?