Explanation:

- Rohit spends 30% of his salary on groceries, leaving him with 70% of his salary.

- From the remaining 70%, he spends 20% on rent and 50% on loan payments.

- His savings of Rs. 14,700 are from the leftover amount after rent and loan payments.

- We can express his remaining salary after groceries as \(0.7 \times\) salary.

- Rent is 20% and loan is 50% of this remaining part.

- Remaining 30% after rent and loan, \((0.3 \times 0.7 \times \text{salary})\), equals Rs. 14,700.

- Solving for salary: \((0.3 \times 0.7 \times \text{salary}) = 14,700\).

- Thus, \(\text{salary} = \frac{14,700}{0.21} = Rs. 70,000\).

- Correct option: Option 4: Rs. 70,000