am i correct on this?

It has been a rough month! Things were going really well and you decided it would be a good time to buy a new kitchen table. You did save for this purchase, but you had the money (just enough) in your savings. Two days after the table was delivered to your house you found out you needed a major dental procedure. Worse yet, because you were upset, you didn't see a stop sign and ran into another car. With nothing in your savings or checking account, you were forced to put these bills on your credit card. The total of the dentist was $500 and the repairs to your car cost $2,500. After the first month, you were only able to $500 off the credit card. Your credit card charges an APR of 18%. What is the amount of interest you will be charged after the first month? $450.00 $37.50 $45.00 $540.00