A Sum of Rs. 10,500 amounts to Rs. 13,825 in $$3\frac{4}{5}$$ years at a certain rate percent per annum simple interest. What will be the simple interest on the same sum for 5 years at double the earlier rate?

A. Rs. 8,670

B. Rs. 8,750

C. Rs. 8,470

D. Rs. 8,560

Answer: Option B

Solution (By Examveda Team)

$$\begin{array}{l}3\frac{4}{5}\text{yr}\stackrel{\text{S}\text{.I}}{\to }133\\ 1\text{yr}\stackrel{\text{S}\text{.I}}{\to }35\\ \text{If rate is double}\\ 1\text{yr}\stackrel{\text{S}\text{.I}}{\to }70\\ 5\text{yr}\stackrel{\text{S}\text{.I}}{\to }350\\ 420\stackrel{\text{Unit}}{\to }10500\\ 1\stackrel{\text{Unit}}{\to }25\\ 350\stackrel{\text{Unit}}{\to }350\times 25=8750\end{array}$$