Assume Total Income

Let Anil's total monthly income be $x$.

$\text{Total}\ \text{Income} = x$

Calculate Remaining Income after Rent

He spends $40\%$ of his income on rent. The remaining income is $60\%$ of $x$.

$Remaining_1 = x \times \left(1 - \frac{40}{100}\right) = 0.60x$

Calculate Remaining Income after Medicines

He spends $40\%$ of the remaining income on medicines. The amount left is $60\%$ of $0.60x$, which represents his savings.

$\text{Savings} = 0.60x \times \left(1 - \frac{40}{100}\right) = 0.60 \times 0.60x = 0.36x$

Equate Savings and Solve for Income

Given that his monthly savings are $₹7,200$, we set $0.36x = 7200$. Solving for $x$: $x = \frac{7200}{0.36} = 20,000$

$x = \frac{7200}{0.36} = 20,000$