Mousa borrowed $6,000 to buy a car and he will make 36 monthly payments of $185.81 to repay the loan. how much total interest will he pay over the life of the loan?

Depends on his credit score. not enough info, IE: credit score, answer choices, interest rate.
My guess would be having an interest rate of 7.5% the answer would be:
His total interest would be $718.94   

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct

D. i think it is the savings