Answer:
D. 3.29 years
Step-by-step explanation:
Payback period = Initial cost / (An annual increase in net income after tax + Depreciation per year )
Payback period = $473,000 / [$105,000 + ($473,000-$84,000)/10]
Payback period = $473,000 / [$105,000+$38,900
Payback period = $473,000 / $143,900
Payback period = 3.28700
Payback period = 3.29 years