Answer:
To calculate the interest earned on the R9000 invested at 8%p.a simple interest for 3 years, you'll need to use the formula I = Prt.
I = Interest earned
P = Principal amount (R9000)
r = Rate of interest (8% = 0.08)
t = Time (3 years)
Plugging in the values, we get: I = 9000 x 0.08 x 3 = R2160.
Therefore, the interest earned on the R9000 invested at 8%p.a simple interest for 3 years is R2160.