The government is considering undertaking the four projects listed below.These projects are mutually exclusive, and the estimated present worth of their costs and the present worth of their benefits are shown in millions of dollars.All projects have the same duration.

Projects	PW of Benefits	PW of Costs
A1	40	85
A2	150	110
A3	70	25
A4	120	73

Assuming no do-nothing alternative, which alternative would you select?Justify your choice by using a benefit-cost (BC(i)) on incremental investment.

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