Completing a calculation

I am a very new (3 day) Storyline user and need help with number variables. I'm trying to complete a replicate a calculation I saw on the webinar on how to calculate 401K contribution. My 3 variables are: annual salary, % of salary to contribute, and how many years to retirement. The calculation needs to be salary x % x years but I have no idea how to make that happen. Can anyone help?

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