Vimal earns ₹20 per day. How much will he earn in 5 days?

The correct option is D ₹100
Vimal's earning per day = ₹20
Vimal's earning in 5 days $=₹20\times 5$
$\begin{array}{ccccc}& & & 2& 0\\ & \times & & & 5\\ & & 1& 0& 0\end{array}$

Therefore, Vimal will earn ₹100 in a week.