Michael J. answered 11/14/16
Tutor
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Effective High School STEM Tutor & CUNY Math Peer Leader
Subtract $24 from $30.
$6
Then divide this amount by $24.
$6 / $24 = 0.25
Multiply this value by 100 to get the markup rate.
0.25 x 100 = 25
Markup rate is 25%.
If you want, I can show you an equation to get the markup rate.