a) 7%
b) 5%
c) $$7\frac{1}{8}$$ %
d) 10%
Answer: d
Explanation:
$$\eqalign{
& {\text{Let rate }}\% {\text{ = R}} \cr
& \frac{{5000 \times 2 \times {\text{R}}}}{{100}} + \frac{{3000 \times 4 \times {\text{R}}}}{{100}} = 2200 \cr
& 100{\text{R}} + 120{\text{R}} = 2200 \cr
& 220{\text{R}} = 2200 \cr
& {\text{R}} = 10\% \cr
& {\text{Required rate}}\% \cr
& = 10\% \cr} $$
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