RPN+Calculator+Multiplication

As a user, I want to be able to multiple two numbers so that I don't have to do the work manually

UAT

 * [] 8 5 -> [40]
 * [] 8 -> [0]
 * [] -4 2 -> [-8]
 * [] .5 10 -> [5]
 * [] -7 -1 -> [7]

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