To answer this question, we have to keep in mind that when you are trying to figure out commission, you are taking away a percentage of the amount of money you are getting commission from. 10% of 3,000 is 300, as whenever you are taking 10% off of a number ending in a zero, you can take away that zero and that is 10% of the number. Since the goal is to earn $550 in commission, we simply subtract:
