Hello can someone explain me how to do this question in the financial calculator

Kangaroo Autos is offering free credit on a new $15,000 car. You pay $300 down and then $490 a month for the next 30 months. Turtle Motors next door does not offer free credit but will give you $1,140 off the list price. a. If the rate of interest is 0.83% a month, calculate the present value of the payments to Kangaroo Autos. (Do not round intermediate calculations. Round your answer to 2 decimal places.) b. Which company is offering the better deal? Turtie Motors Kangaroo Autos redit on a new $15,000 car. You pay $300d offer free credit but will give you $1,140 off a month, calculate the present value of the r to 2 decimal places.)