Calculate Total Income

Given that 30% of income is spent on petrol, which equals ₹300, we find the total income $I$: $0.30 \times I = 300$, so $I = 1000$.

$I = \frac{300}{0.30} = 1000$

Find Remaining Income

After spending ₹300 on petrol, the remaining income is $1000 - 300 = 700$.

$\text{Remaining} = 1000 - 300 = 700$

Calculate House Rent

Suresh spends 1/4 of the remaining income on house rent.

$\text{Rent} = \frac{1}{4} \times 700 = 175$