Storing Live Currency Symbols in Non-Persistable Entities and Performing Calculations

I have two non-persistable entities in my Mendix application: "Root" and "Input". The "Root" entity has four decimal attributes representing currency symbols, which I obtained through a mapping. These currency symbols retrieve live currency values. In the "Input" entity, I have two attributes named "From" and "To", which are enumeration data types representing currency symbols. My goal is to store the currency symbols from the "Root" entity into the "Input" entity, perform a multiplication between the "From" and "To" attributes, and store the result in a third field. I would like assistance in achieving this functionality in the most effective and efficient way. If there are alternative approaches or best practices for handling live currency data and performing calculations in Mendix, please kindly provide guidance and suggestions. Thank you in advance for your support.
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