a) 6 years and 8 months
b) 7 years and 3 months
c) 6 years
d) 7 years and 6 months
Answer: a
Explanation:
$$\eqalign{
& {\text{Let}}\,{\text{time}}\,{\text{is}}\,T\,{\text{years}}. \cr
& {\text{According}}\,{\text{to}}\,{\text{question}}, \cr
& \frac{{1750 \times 9 \times T}}{{100}} = \frac{{\left( {2500 \times 10.5 \times 4} \right)}}{{100}} \cr
& \,T = \frac{{ {2500 \times 10.5 \times 4} }}{{1750 \times 9}} \cr
& \,T = 6.66 = 6\,{\text{years}}\,{\text{and}}\,8\,{\text{months}} \cr} $$
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