Multiplying a number with percentage to get a determined sum

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What percentage do we have to multiply with 125 dollars to get 355 dollars?

125(100/x) = 355

12500/x= 355

12500 = 355*x

x = 12500/355 = 35,211…

125 dollars * 1,35 = 168.75 dollars (wrong)

125 dollars * 3,5 = 437.5 dollars (also wrong)

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$$125\cdot\frac{x}{100}=355$$ $$x=\frac{355\cdot100}{125}=284$$ $$125\cdot2.84=355$$