Question 333639
let A=after amount
let B=before amount
let p=percent change
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A=B*p
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in your example
A=117
B=unknown,need to find
p=160%=1.6
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solve for B, which is what you want
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B=A/p = 117/1.6=73.125 or around 73
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verify
73*1.6=116.8 or 117