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### Question

A merchant purchased 37 Kg of wheat at the rate of 6.00 Rs./Kg, and 63 Kg wheat at 8.00 Rs./Kg. At what rate must he sell the mixture to make an overall gain of 5%?

**A**

7.62.

**B**

8.62.

**C**

6.62.

**D**

9.62.

**Soln.**

**Ans: a**

The overall cost is $37 × 6 + 63 × 8$ = Rs. 726. Add a profit of 5% to get SP = $726 + (5 × 726)/100$ = Rs. 762.3. So the rate = $762.3/{37 + 63}$ = $762.3/100$ = 7.62.