Find the simple interest for the indicated length of time. $7915 at 9% interest for 9 months?

Answer 1

interest - P* R * t /100

P = $7915

R = 9%

t = 9 months = 9/12 yrs = 0.75

I = 7915*9*0.75/100

Answer 2

I = PRT
= 7915x.09x9/12
= ...

Answer 3

The answer would be $534.26!? What confused me was the nine months, I wasn't sure how to compute that.