a) 10%
b) 20%
c) 30%
d) 40%
Answer: c
Explanation:
$$\eqalign{
& {\text{Let rate is }}R\% \cr
& {\text{Now}}, \cr
& P = 100, \cr
& A = 400, \cr
& I = 400 – 100 = 300, \cr
& {\text{Time}},\,T = 10\,{\text{years}} \cr
& I = \frac{{PTR}}{{100}} \cr
& R = \frac{{ {100 \times I} }}{{PT}} \cr
& R = \frac{{ {100 \times 300} }}{{ {100 \times 10} }} \cr
& {\text{Hence}},{\kern 1pt} R = 30\% \cr} $$
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