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 Question from barbara: i ran across the same question using 10%, my question is this, I have $751,400, which has been marked up 20%. I want to know the original amount prior to mark up.... can you give me the formula.? Hi Barbara, If the original amount was$A and you wanted to mark it up p% you would multiply $A by p/100 and add that to$A to obtain the marked up price of $751,400. That is$A + $A × p/100 =$751,400.

This is

$A(1 + p/100) =$751,400.

You have p = 20 so this expression is

$A(1.20) =$751,400

and hence

$A =$751,400/1.20.

Penny

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