Answer:
Nick must save up $125 each month.
Explanation:
In order to find this, we first have to find the number of months he has. We can do this by multiplying the number of years by 12.
4 * 12 = 48
Now we need to know how much he needs to save. We can find this by taking the total cost and subtracting his parental contribution.
18,000 - 12,000 = 6,000
Now that he have the amount he needs to save and the number of months he has, we can divide the two to get the monthly savings he will need.
6,000/48 = $125