Question: My credit card balance is ₹50,000. The card charges 3% interest per month, and I've decided to pay a fixed ₹2,500 every month (not a percentage of the balance) until it's cleared, without any new spending. Roughly how many months will it take to clear the balance, and how much total interest will I end up paying?
Answer: The balance will be cleared in approximately 31 months, and total interest paid will be approximately ₹27,500.

Supporting evidence:
title: Inline formula / method note
quote: Standard fixed-payment loan amortization formula, solved for number of periods
context: Standard fixed-payment loan amortization formula, solved for number of periods.