A) 5
B) 3/5
C) 8/5
D) 1/5
Correct Answer: B
Solution :
\[\frac{a}{1-r}=20\] .....(i) \[\frac{{{a}^{2}}}{1-{{r}^{2}}}=100\] ?..(ii) From (i) and (ii), \[\frac{a}{1+r}=5\], \[\left[ \because a=20(1-r)\,\,\text{by}\,\,(i) \right]\] Þ \[\frac{20(1-r)}{1+r}=5\] \[\Rightarrow 5r=3\] Þ \[r=3/5\].
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