The total amount borrowed is $22,500 - $4,000 = $18,500.
To calculate the total interest, we need to first calculate the total amount of payments over 4 years. There are 12 months in a year, so the total number of payments will be 12 x 4 = 48 payments.
To calculate the monthly payment, we can use the formula for a fixed-payment loan:
Monthly payment = [P x r x (1 + r)^n] / [(1 + r)^n - 1]
where P is the principal (amount borrowed), r is the monthly interest rate, and n is the total number of payments.
The monthly interest rate is 6% / 12 = 0.005.
Monthly payment = [18500 x 0.005 x (1 + 0.005)^48] / [(1 + 0.005)^48 - 1] = $430.87 (rounded to the nearest cent)
The total amount paid over 4 years is $430.87 x 48 = $20,666.62.
The total interest paid is $20,666.62 - $18,500 = $2,166.62.
Therefore, the interest owed to the bank for borrowing the money is $2,166.62.
The cost of the car per month paid over 4 years is $430.87.