A car is purchased for a downpayment of $3,000 with an additional monthly payment of $400 for 36 months. The formula for the amount spent on the car is $\displaystyle{S}={3000}+{400}\cdot{M}\usepackage{cmbright}\Huge\$ , where $\displaystyle{S}\usepackage{cmbright}\Huge\$ is the current amount of money that has been spent and $\displaystyle{M}\usepackage{cmbright}\Huge\$ is the number of months of payments that have been made.

i) How much money will have been spent after a year?

ii) What will be the final cost of the car?