a) 9%
b) 10%
c) 10.5%
d) 12%
Answer: b
Explanation: Let the total amount = Rs. 6
Total average rate of interest
$$\eqalign{
& {\text{ = }}\frac{{\left( {3 \times 10\% } \right) + \left( {2 \times 9\% } \right) + \left( {1 \times 12\% } \right)}}{6} \cr
& = \frac{{\left( {30 + 18 + 12} \right)}}{6} \% \cr
& = 10\% \cr} $$
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