Consider the following abbreviated financial statements for a proposed investment:

Year 0 1 2 3 4

Gross Book Value $160 $160 $160 $160 $160

Accumulated Dep. 40 80 120 160

Net Book Value $160 $120 $80 $40 $0

Sales $95 $90 $97 $80

Costs 33 30 25 10

Depreciation 40 40 40 40

Taxes (50%) $11 $10 $16 $15

Net Income $11 $10 $16 $15

What is the average accounting return (AAR) for proposed investment? This project will use straight-line