PHP Math , Percentages 1

[JSProgramIA]

Yeah I know, this is simple High School stuff, but I must have skipped that day.

$unit_cost      = "45.00";
$selling_price  = "52.45";

$the_markup     = ???;        // Need percentage of markup  here

Embarrassingly thankful for any help.

 

[Dweezel]

Here ya go

$differnce = $selling_price - $unit_cost;

$the_markup = ($difference / $unit_cost) * 100;