Walsh and Rose s enterprise is trying to select the best investment from among four alternative.Each alternative involves an initial outlay of $$100000$ and a $10\%$ cost of capital $.$There cost follow follows Year $1$ project a $10000,$project b $50000,$year $2$ project a $20000$ project b $40000,$year $3$ project a $30000$ project b $30000,$ year $4$ project a $40000$ project b $)$