New Delhi, Dec. 16 -- If you carry a credit card from India while travelling abroad and use it at a merchant overseas, you should remember that you will be charged a conversion mark-up fee.

This mark fee typically varies between 1.5 to 3.5 percent of the converted Indian currency. Over and above of this conversion mark up fee, you will also be charged GST at 18 percent interest.

1. First you convert the foreign currency into Indian currency at the exchange rate. This is done by using the card network's exchange rate (e.g., Visa or Mastercard).

2. On the converted amount, you can calculate the currency mark-up. Banks typically charge a mark-up fee, which ranges between 1.5 to 3.5 per cent of the converted Indian rupee amount.

3. After ...