Answer: 50$
Explanation:
To calculate the amount the college student can spend on fast food in December, we need to find the total amount he can spend in 5 months, given that he wants to spend an average of $50 per month.
Let's start by finding the total amount he can spend in 5 months:
Total amount = 5 x $50 = $250
Now, we can subtract the amount he spent in the other 4 months from the total amount to find out how much he can spend in December:
The amount he can spend in December = Total amount - Amount spent in 4 months
Amount spent in 4 months = $35 + $90 + $15 + $60 = $200
Amount he can spend in December = $250 - $200 = $50
Therefore, the college student can spend $50 on fast food in December to meet his goal of spending an average of $50 per month on fast food for the remaining 5 months of the year.