Final-Answer:
(1) Net cashflows:
Year 1: $450,000 = $1,200,000 x 37.5% - $160,000
Year 2: $612,000 = $1,680,000 x 37.5% - $160,000
Year 3: $1,126,000 = $3,040,000 x 37.5% - $160,000
Year 4: $968,000 = $2,560,000 x 37.5% - $160,000
Year 5: $768,000 = $1,920,000 x 37.5% - $160,000
(2) Payback period:
$1,500,000 / $450,000 = 3.33 years
(3) ARR:
is ($450,000 + $612,000 + $1,126,000 + $968,000 + $768,000) / $1,500,000 = 1.24 = 124%