Hello Rucus.
Like lowside67 mentioned, it really, really doesn't add up.
I was already going "huh" 5 seconds into reading your post.
7.18% won't end up costing you half of the cost of the car to cover your interest.
I am estimating, perhaps, 25% to 30% of the car.
Get the firm final price with everything included, and go from there.
Use an easy online calculator:
Car Loan Calculator ~ Auto Loan Payment Calculator
Oh, and 7.18% is a high rate.
If you want to try, you can go to your local bank to get a lower rate around the 4% to 5% range.
If you really want the car, and don't want it to be sold to someone else (while you try a bank), put a deposit on it (and make sure it is refundable), and then try out a bank loan (which sometimes takes up to 4 business days to get approved).