Adding to Variables with each new choice

A learner has three choices, each with a different variable attached to it. Once they have chosen their answer, they will be directed to the next page where they will again have three choices (each with a new variable).  I would like the variable from page one to show up on page two and then have the new choices (on page 2) ADDED TO the variable from page one.  eg: page one choice = 50.  page two show their choice as 50 + their new choice (either 50,100 or 150).   So the number on page 2 would at first be 50 but then change to 100,150 or 200 based on their new choice.  This goes on for several pages - each adding the new choice to the previous total.  Any suggestions?  Thanks much for your help!!!

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