How to create a button in Excel

I have attached a spreadsheet and tried to explain what I am trying to do. Basically, on Sheet 1, I have 3 options. I will click on one of those 3 options. Depending on which one i click on, it takes both values I put on Sheet1, then puts it on Sheet 2, does some math, then returns a total back on Sheet1. After looking at this, I hope its clear to you. :) I am guessing its a macro, i tried a few things but couldn't figure it out. Thanks!!!