Shishir and Vinay borrowed $Rs. 2500$ and $Rs. 300$ respectively at the same rate of simple interest for $2 \large\frac{1}{2}$ years. If Vinay paid $Rs. 175$ more interest than shishir, find the rate of interest per annum .

Question

$\begin{array}{1 1} 10\% p.a \\ 12 \% p.a \\ 14 \%p.a \\ 20 \% p.a \end{array} $