A) \[\frac{{{a}_{1}}}{{{b}_{1}}}=\frac{{{a}_{2}}}{{{b}_{2}}}\]
B) \[\Rightarrow \]
C) 2n years
D) 4n years
Correct Answer: C
Solution :
Let principal = Rs.x and rate = R According to question, \[{{R}_{2}}%\] \[{{n}_{2}}\] \[{{R}_{k}}%\] Let it become 4 folds in N years So, \[x{{\left( 1+\frac{R}{100} \right)}^{N}}=4x\] \[V={{V}_{0}}{{\left( 1-\frac{{{R}_{1}}}{100} \right)}^{{{n}_{1}}}}.{{\left( 1-\frac{{{R}_{2}}}{100} \right)}^{{{n}_{2}}}}....{{\left( 1-\frac{{{R}_{k}}}{100} \right)}^{{{n}_{k}}}}\] N = 2n years
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