Need explanation for "profit as a percentage of the selling price."
In my textbook it gives an explain for profit as a percentage of the cost price and profit as a percentage of the selling price.
It gives an example like this: "A shopkeeper sold an article costing $50 for $60... he makes a profit of $10... find the profit as a percentage of the cost price and profit as a percentage of the selling price."
What does this mean exactly? I know the formula on how to calculate these but what are the points of finding the profit in cost price terms and selling price terms? You get two different percentages but what do they tell you?
Thanks!