240 is the correct answer.
The formula is 1/2 times base times height. So,your answer is B
X = 0
Y = -2
You can plug them in just to check if you want
10*350= 3500
Total amount paid- 1500+3500= 5000
So an amount of $5000 was paid to cover the cost of $4500 within the 10 month period.
So you answer is A. 33%