A new airport addition is under consideration. Five different proposals have all been "qualified" as satisfactory from functional, environmental, and aesthetic standpoints and now the airport board is in the benefit-cost analysis phase. Benefits and costs are summarized as follows:

a. Which addition should be adopted based on a proper \(B / C\) analysis?

b. Which addition should be adopted based on a proper \(B-C\) analysis?

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Proposal Benefits in $K/year Costs in $K/year #1 $1,800 $1,470 #2 $1,260 $1,300 #3 $1,590 $1,050 #4 $2,000 $1,800 #5 $1,550 $1,160