element decaing at a rate of 12%/h

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An element is decaying at a rate of 12%/h. Initially we have 100g. How much remains after 10hrs.

I thought you do this: P(t)=Pinitial(rate)^time
=100(1.12)^10 but I got the wrong answer so can you help me out on finding how to get the right answer?

Thanks
 
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