SSC CGL Model Paper 7

Principal = Rs 420
Rate = $10\%=\frac{1}{10}=\frac{1\to \mathrm{Interest}}{10\to \mathrm{principal}}$
$\begin{array}{cc}\mathrm{Principal}& \mathrm{Installment}\\ 10\times 11& 11\times 11\\ 100& 121\end{array}$
→ Installment is same in both the years, so equate the installment, we have
Principal → $110+100=210$
Installment → $121+121=242$
→ ATQ,
210 units → Rs 420
1 unit → Rs 2
121 units → 2 × 121 = Rs 242
Hence, required value of installment is Rs 242