Suppose there is new investment of Rs. 10 crores and the MPS is 0.2 the aggregate income increases by -

Given $\Delta I = \text{Rs. } 10\text{ crores}$ and $MPS = 0.2$, the investment multiplier is $k = \frac{1}{MPS} = \frac{1}{0.2} = 5$. Therefore, aggregate income increases by $\Delta Y = k \times \Delta I = 5 \times 10 = \text{Rs. } 50\text{ crores}$.