Answer:
C
Explanation:
Monthly salary is $1,750 plus commission for every car he sells.
If he sells 1 car, then his monthly income is $2,250
This means his commission for every car sold is 2250 - 1750 = $500
Thus M = 500n + 1,750
To confirm lets substitute 5 as n.
M = (500 x 5) + 1750
M = 2500 + 1750
M = $4,250
This matches the answer found in the table.