a) 3.5 years
b) 4 years
c) 4.5 year
d) 5 years
Answer: b
Explanation:
$$\eqalign{
& {\text{Time}} = \left( {\frac{{100 \times 81}}{{450 \times 4.5}}} \right){\text{years}} \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\, = 4\,{\text{years}} \cr} $$
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