No one taught you interest did they?
A car note works by charging your 1/12 of the Annual Percentage Rate on the total amount each month. You're making a payment every month so the amount you borrowed is less every month.
According to your standard payment calculator:
2 year 24 month loan on $6,000 = $317/mon
BankRate Auto Loan Calculator
So that means in the 1st month:
Month 1: 6,000 x (.24 / 12) = 120 in interest + 197.23 principle = 317 payment
Month 2: 5,802.77 x (.24 / 12) = 116.06 in interest + 200.94 principle = 317 payment
...
It's called an amortization table.
A 24% APR note on $6,000 would get you $1,613 in total interest payments over 2 years. 317 x 24 months.