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The relationship between mark-up and margin

Answer Text:
The relationship between mark-up and margin:
- If the mark-up is known , then the margin is determined by adding the numerator to the denominator.
e.g if mark-up=#1/4# then margin=#1/(4+1)#=#1/5# or 20%
-if the margin is known,you can convert it to mark-up by deducting
the number of the margin from the denominator.
E.g if margin=#1/5# then, mark-up =#1/(5-1)#= #1/4# or 25%