• # question_answer There is 80% increase in an amount in 8years at simple interest. What will be the compound interest of Rs. 14000 after 3 years at the same rate. A)  Rs. 3794                      B)  Rs. 3714C)  Rs. 4612                      D)  Rs. 4634

(d): To find rate of interest A = 1.8 P $1.8p=p\left[ 1+\frac{8r}{100} \right]$ $\Rightarrow 1.8-1=\frac{8r}{100}$ $\Rightarrow 0.8=\frac{8r}{100}$ $\Rightarrow r=10%$ C.I on 14000/- $C.I=14000\left[ {{\left( 1+\frac{10}{100} \right)}^{3}}-1 \right]$ $=14000\times \left[ {{1.1}^{3}}-1 \right]$ $=14000\times 0.331$ $=Rs.4634/-.$