[求助]求ARR accounting, investment, determine, building, business

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  You're trying to determine whether or not to expand your business by building a new manufacturing plant. The plant has an installation cost by$17million,which will be depreciated stright-line to zero over its four-year life .If the plant has projected net income of $1,735,000,$2,105,000,,$1954,000,and $1,342,000over these four years ,what is the project's average accounting return(ARR)?

 

ARR=Average Profit After Tax/Average investment 答案是70.9%

Year  CF  Average After Tax Profit
1.   1,735      4.25
2.   2,105      4.25
3.   1,954      4.25
4.   1.342      4.25
Total:7.136      17
 (17-0)/4=4.25
=21%这个是我之前算的，但是答案是70.9%，这个感觉很神奇，所以我不懂，高手指教下