a) 8%
b) 9%
c) 5%
d) 6%
Answer: c
Explanation:
$$\eqalign{
& {\text{Let}}\,{\text{rate}}\,{\text{is}}\,R\% \cr
& {\text{According}}\,{\text{to}}\,{\text{the}}\,{\text{question}}, \cr
& \left[ {\frac{{400 \times 2 \times R}}{{100}}} \right] + \left[ {\frac{{100 \times 4 \times R}}{{100}}} \right] = 60 \cr
& 8R + 4R = 60 \cr
& {\text{Hence}},\,R = 5\% \cr} $$
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