A shopkeeper purchased 70 kg of potatoes for Rs. 420 and sold the whole lot at the rate of Rs. 6.50 per kg. What will be his gain percent? Select the correct option.
A) 8 1/8 %	B) 8 3/3 %	C) 8 1/3 %	D) 2 1/3 %	E) 8 6/3 %
Explanation:   C.P. of 1 kg = 420/7 = Rs. 6   S.P. of 1 kg = Rs. 6.50   Gain % = 0.50/6 * 100 = 25/3 = 8 1/3 %   Answer: 8 1/3 %
<result>C</result>
A shopkeeper purchased 70 kg of potatoes for Rs. 420 and sold the whole lot at the rate of Rs. 6.50 per kg. What will be his gain percent?