Making foreign currencies work with our app

[COC]

Hello, we just recently launched an app that will allow customers to plant a tree for $0.50 at checkout. We just had a store in India download our app and their currency is set in Rupees. The pricing stayed at 0.50 however, and with the exchange rate, 0.50 Rupees is not nearly enough for us to get the tree planted. My question is, is there a way to make it so our app is pegged at $0.50 USD and then any stores using a different currency will automatically have the price adjusted to be the same as $0.50 USD and always update based on the exchange rates?

Thank you!