Collecting currency is my hobby and now I have a good amount of currency, do i need to pay khums on that curency? Also what if i don't have that much money to pay the conversion ,example i have a 100 dollar note of usa and I'm from india, that means its value is around 7000 INR but I dont have money to pay its khums, what to do in that situation?

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Yes, you have to pay the khoms of the currencies with the present market value.
You can sell 20% of each currency, and pay the khoms.