A merchant has 100 kg of sugar, part of which he sells at 7% profit and the rest at 17% profit. If he gains 10% on the whole, the amount sold at 7% profit is
A)40 kg
B)35 kg
C)70 kg
D)60 kg
Correct Answer:
C
Solution :
Average rate of profit = 10 % Two parts should be in the ratio = 7 : 3 Amount sold at 7% profit \[=\frac{7}{10}\times 100=70\,kg\]