400*1.12^n=4000

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Solution for 400*1.12^n=4000 equation: 



400*1.12^n=4000

We move all terms to the left:

400*1.12^n-(4000)=0

Wy multiply elements

400n-4000=0

We move all terms containing n to the left, all other terms to the right

400n=4000

n=4000/400

n=10

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