Answer:
C. $2,700
Step-by-step explanation:
First, we need to know how much they had saved. So, if they save $300 each month for 15 years, the total amount saved is:
$300 x 15 years x 12 months = $54000
Then, they have a goal of $150,000, so they need to save $96,000 in the next 3 years because:
$150,000 - $54,000 = $96,000
Finally, 3 years have 36 months because
3 x 12 months = 36 month
So, to know how much would they need to save each month, we should divide $96,000 by 36 months:

Therefore, they need to save $2700 each month for the next 3 years to reach their goal.