From the salary of an officer, 10% is

Let the total salary be ₹$x$.

Step 1: House rent deduction
10% is deducted, so the remaining salary becomes
$0.9x$

Step 2: Conveyance expense
He spends 20% of this amount, so remaining salary is
$0.8 \times 0.9x = 0.72x$

Step 3: Income tax deduction
20% of the remaining amount is deducted, so balance becomes
$0.8 \times 0.72x = 0.576x$

Step 4: Clothes expense
10% of this balance is spent, so remaining amount is
$0.9 \times 0.576x = 0.5184x$

Step 5: Final amount given
He is left with ₹23,328, therefore

$0.5184x = 23328$

$x = \frac{23328}{0.5184} = 45000$

Answer: ₹45,000