a) 3
b) 4
c) 5
d) 6
Answer: b
Explanation:
$$\eqalign{
& P{\left( {1 + \frac{{20}}{{100}}} \right)^n} > 2P\,\,\, \Rightarrow \,\,\,{\left( {\frac{6}{5}} \right)^n} > 2 \cr
& \left( {\frac{6}{5} \times \frac{6}{5} \times \frac{6}{5} \times \frac{6}{5}} \right) > 2 \cr
& n = 4\,{\text{years}} \cr} $$
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