Math Help Please!

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My investment in Edgewater stocks is losing half its value every 2 years. Find and interpret the associated decay rate.

If I use the formula y=100(1/2)^x (<-- Is that correct?)

I got the answer of 0% (its wrong), I used a different formula, which should be wrong and got the answer of 25% and 34%

Is that the formula to solve the equation? Why is it wrong? How should I solve it?

Thank you

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