Use the formula I=Prt.
P is the principal (amount of money borrowed)
R is the interest rate (per year)
T is the time (expressed in years)
Plug in your numbers, remembering to change 10.8% to a decimal.
I=Prt
I=2700 x 0.108 x 3
I=874.8
12 X 3= 36 months
874.8 / 36=24.3
Therefore, Sabrina will pay $24.30 per month