BSAS Question #9

Can someone explain how the total return of 19.9% was calculated? Month P: Sept P: Aug change in spot July 9.13 9.00 0.08 August 9.28 9.11 0.08 Sept 9.14 9.17 0.08

Was given, I just don’t understand where the hell the annualized spot return came from

Total return = Spot return + Asset return + Roll return (roll yield)

if you can post main information