A) 91%
B) 10%
C) 11%
D) 21%
Correct Answer: D
Solution :
\[Rs.1000+S.I.\] on \[Rs.1000\] for 11 months \[=Rs.1000+S.I.\] on \[Rs.100\] for \[(1+2+3+4+....+10)\] months \[Rs.1000\] S.I. on \[Rs.\text{ }100\] for 100 months \[=Rs.1000+S.I.\] on \[Rs.100\] for 55 months S.I. on \[Rs.100\]for 55 months \[=Rs.100\] \[\therefore \] Rate \[=\left( \frac{100\times 100\times 12}{100\times 55} \right)%=21\frac{9}{11}%\]
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