Compound Interest Calculator

I am working on a retirement plan education program that includes taking the current balances from multiple defined contribution plans and estimating their balances at the time of retirement at a set interest rate.  I can do this in excel - but cannot figure out how to do it with triggers.   User would: enter account balance(s), #years till retirement, and target % (with default of 2%) to get Results: estimated account balances at retirement. 

Basically - I need to create a compound interest formula using triggers, is that possible?   (thanks in advance for helping a new Storyline2 user)

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