Explanation:

Let's solve step by step:

- Let Amit's total salary be Rs. x.

- He spends 40% on food. Left = 60% of x = 0.6x

- Out of remaining, he spends 20% on entertainment. Spent = 0.2 × 0.6x = 0.12x. Left = 0.6x - 0.12x = 0.48x

- Out of this, he spends 20% for bills. Spent = 0.2 × 0.48x = 0.096x. Left = 0.48x - 0.096x = 0.384x

- This leftover (0.384x) is his savings. Given: 0.384x = 24,000

- x = 24,000 / 0.384 = Rs. 62,500

Therefore, the correct option is:

Option 4: Rs. 62,500

Other options are not correct because the division would not return your given result for savings.

- Option 1: Would give less savings than 24,000.

- Option 2/5: Both are above 62,500, so would give too high savings.

- Option 3: Not matching calculations.

So, option 4 is correct!