Math CentralQuandaries & Queries


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.


About Math Central


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.
Quandaries & Queries page Home page University of Regina PIMS