A shopkeeper purchased 80 kg of potatoes for Rs. 550 and sold the whole lot at the rate of Rs. 9 per kg. What will be his gain percent?  Pick:  A) 22.6 %  B) 30.9 %  C) 35.6 %  D) 39.5%  E) 23.6 %
C.P. of 1 kg = 550/80 = Rs. 6.875
S.P. of 1 kg = Rs. 9
Gain % = 2.125/6.875 * 100 = 212.5/6.875 = 30.9 %
Answer: 30.9 %
<result>B</result>
A shopkeeper purchased 80 kg of potatoes for Rs. 550 and sold the whole lot at the rate of Rs. 9 per kg. What will be his gain percent?