A store pays $10.56 fora map of Africa and marks the price up by

50%.

What is the amount of the mark-up?

Essentially, 50% of $10.56 is $5.28.

This means that all we have to do is add $10.56 to $5.28, making $15.84

Side note: Another way that you can do this is by simply doing 1.5 (10.56).