A simple percentage question

Your Guru has just booked a car.

The cost of the car is $52500.
She has placed a downpayment of $5000.

1.
How much will be monthly repayment be if she took a 5year loan at 2.85% p.a. simple interest?

2.
In the total price of the car, one component is the COE rebate of $5000.
It works in this way: If the COE for that month falls below $5000, the excess will be refunded to your Guru. (E.g. if COS costs $3000, she gets $2000 back) If the COE costs more, she does not have to top up any money.
Find the total cost of the car (inclusive of interest) if the COE price is
a. $7800
b. $2800

To know which car.... google for it. Suzuki SX4. You all will only get to see it next term, cos the car will only be available in late May.