Scrolling bar that gives a value?

Hello!
How do I make this scrolling bar that gives a value? Example:
There is a throwing game and I am scrolling this bar up to the middle so it gives 50% power or whatever. If I scroll it up 3/4 of the max. distance it gives 75% power, and a little more and it will give 76% power etc.
I get it if you guys dont understand so if needed, I will provide a better description. Please help me guys!

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