I was looking for a strategy for a problem I was working on

A car may be purchased with a 3k downpayment now and 60 month payments of 280. If the interest rate is 12% compounded monthly, what is the price of the car?

I know that 12% is the nominal rate and that you have to divide 12% by 12 months to get 1% interest per month.

So do I find the effective rate and than apply that interest rate to the 5 years of payments made?