Answer
The interest charged will be 510 dollars.
Work Step by Step
To find the interest charged, we use the interest formula.
The interest formula is: I = P $\times$ r $\times$ t
P = 8000
r = 8.5% = 0.085
t = 9 months = 9 $\times$ $\frac{1}{12}$ = 0.75 (Because 1 month = $\frac{1}{12}$ year.)
Substitute these values in the formula to obtain:
I = 8000 $\times$ 0.085 $\times$ 0.75
I = 510
The interest charged will be 510 dollars.