hi i am stuck on question in my accounting assignment.

So suppose both Bart and Avant have initially invested $500,000.

what will be the pay-back period (in years and months) for both Avant and Barte if Avant consistenly earns $250,000 for the next 3 years while Barte receives $100,00 in year 1, $300,000 in year 2, and $300,000 in year 3?

thank you :)