In what time will Rs. 1860 amount to 2641.20 at simple interest 12% per annum ?

13 years
2 $3 \frac{1}{2}$ $3\frac{1}{2}$ years
34 years
4 $4 \frac{1}{2}$ $4\frac{1}{2}$ years

Answer:- 1

Explanation:-

Solution:

\begin{aligned} Rate % = 2 % \\ Principal  =  Rs . 1860 \\ Amount  =  Rs . 2641 .20 \\ Interest \\ =  Rs . (2641.20 - 1860) \\ = Rs . 781 .20 \\ By using formula, \\ Required time \\ = \frac{781.20 \times 100}{1860 \times 12} \\ = 3 \frac{1}{2} years \end{aligned}

$\eqalign{ & {\text{Rate }}\% = {\text{2}}\% \cr & {\text{Principal = Rs}}{\text{. 1860}} \cr & {\text{Amount = Rs}}{\text{. 2641}}{\text{.20}} \cr & {\text{Interest}} \cr & {\text{ = Rs}}{\text{. }}\left( {2641.20 - 1860} \right) \cr & = {\text{Rs}}{\text{. 781}}{\text{.20}} \cr & {\text{By using formula,}} \cr & {\text{Required time }} \cr & = \frac{{781.20 \times 100}}{{1860 \times 12}} \cr & = 3\frac{1}{2}{\text{ years}} \cr}$