a) 5%
b) 7%
c) 9%
d) 10%
Answer: d
Explanation:
$$\eqalign{
& {\text{Let}}\,{\text{the}}\,{\text{rate}}\,{\text{be}}\,R\% \,{\text{p}}{\text{.a}}{\text{.}}\, \cr
& {\frac{{5000 \times R \times 2}}{{100}}} + {\frac{{3000 \times R \times 4}}{{100}}} \cr
& = 2200 \cr
& \Rightarrow 100R + 120R = 2200 \cr
& \Rightarrow R = {\frac{{2200}}{{220}}} = 10 \cr
& {\text{Rate}} = 10\% \cr} $$
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