John buys an old scooter for Rs. 2000 and spends Rs. 200 on its repairs. If he sells the scooter for Rs. 2640, his gain percent is :  Choose the correct choice:
A) 10%
B) 20%
C) 10%
D) 5%
E) None of these
Explanation :   Solution: C.P. =Rs. (2000+200) =Rs. 2200; S.P. = Rs. 2640.   Gain% = (440*100/2200)= 
<gadget id="calculator">(440*100/2200)</gadget>
<output>20</output>
20%.   Answer : 20%
<result>B</result>
John buys an old scooter for Rs. 2000 and spends Rs. 200 on its repairs. If he sells the scooter for Rs. 2640, his gain percent is :