Mark up & Margin

Mark up is a % of cost.
Therefore cost = 100%
Where as Margin is a % of sales
Therefore sales=100%

Remember
Cost + Profit = Selling price

If a question indicates Cost plus ….. Just know its Mark-up

Forexample If question says,
Cost plus 25%, this is mark-up,

Draw your imaginary table ie

Cost 100
Profit 25
Sale price 125

NOTE:
Cost + Profit = Selling price

Where as if a question says margin of 25% or profit as a percentage of sales, it refers to MARGIN

The table would be as follows

Cost 75
Profit 25
Sales price 100

However with Margin, since the selling price is already 100%, to determine the cost %, you work backwards so that Cost + Profit =100%

If you have these tables in mind, it becomes easy to use the information given in the question, slot it to the corresponding area of the table and you find the unknown.

GOOD LUCK