Given thatValue of $\text{MPC}=0.9$Initial increase in investment $=\text{₹ 1000}$ croreSo, every increase of $\text{₹ 1}$ in the income, 0.9 part of the increased income will be consumed by people.Consumption $=\text{₹ 0.90}$Saving $=\text{₹ 0.10}$ It is given that initial increase in investment of $\text{₹ 1000}$ will lead to change in the income by $\text{₹ 1000}$ in the first round. As MPC is 0.9 so people will consume 0.9 of the increased income i.e., $\text{₹ 900}$ there by saving $\text{₹ 100}$. In the next round due to increase in the consumption expenditure by $\text{₹ 900}$ there will be an increase in income by $\text{₹ 900}$. Then people will again spend the increased income i..., $\text{₹ 810}$ and save the rest part of the income $\text{₹ 90}$. Similarly, this process will continue and the income will go on increasing as a result of the increase in consumption. The total change in the income is $\text{₹ 10,000}$ and the change in the investment will be $\text{₹ 1,000}$.