Answer:
3 years
Step-by-step explanation:
The Payback period calculates the amount of time it takes to recover the amount invested in a project from its cumulative net cash flows cash flows.
The amount invested is $-1,000,000
In year 1, the amount recovered is $400,000, leaving $-1,000,000 + $400,000 = $-600,000.
In year 2, the amount recovered is 320,000, leaving $-600,000 + 320,000 = -280,000
In year 3, the amount recovered is $280,000, leaving $-280,000 + 280,000 = 0.
The total amount invested is recovered in three years.
The Payback period is 3 years.
I hope my answer helps you