Math is done through OnEvents. You'd need a button with an OnPress property to run the calculations. Rather, that is what you would need if you could perform math on price values. Here's the problem:
Not only are there letters attached to the end of each value, making it so you can't perform math functions on them, the price is one long string ("9999p 99g 99s 99c" is all in the same text object) and we have no way of breaking apart strings (we can't concatenate strings either).
So, unfortunately, what you're trying to do isn't possible. =/
Quib
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