Hello. There is an easy way and hard workaround (free)

The easy way would be to use the BDK plugin here https://bubble.io/plugin/repeatinggroup-tools-bdk-1543937479653x604756044873203700

The hard way is to use custom states and it can be done but can be a bit tricky at times.

You might also need the toolbox plugin for the expression element that can create math equations, unless it is simple enough for bubble.

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