a) Rs. 1500
b) Rs. 1300
c) Rs. 2500
d) Rs. 1000
Answer: a
Explanation: Let the rate be R at which Principal P is invested for 2 years.
According to question,
{Interest at Rate (R + 2)}% – (interest at rate R%) = Rs. 60
$$\frac{{\left( {P \times 2 \times \left( {R + 2} \right)} \right)}}{{100}} – $$ $$\frac{{\left( {P \times 2 \times R} \right)}}{{100}}$$ $$ = 60$$
$$\eqalign{
& \frac{{ {2PR + 4P – 2PR} }}{{100}} = 60 \cr
& 4P = 60 \times 100 \cr
& P = \frac{{60 \times 100}}{4} \cr
& P = {\text{Rs}}{\text{.}}\,1500 \cr} $$
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