b) Plummer Products and Lanigan Construction both have 10 million to invest and they expect to produce the following profits (in ,000s): Time Last year 1 2 3 4 5 6 and thereafter Plummer 1000 1000 1200 1400 1600 1800 1800 Lanigan 1000 1000 1150 1300 1450 1600 1800 Both projects predict a 25% profit margin. For every 1 in sales, Plummer has to provide 5p for increase in cost of providing for credit sales, whereas Lanigan only needs to provide 2p. Additionally Plummer will need 3p per 1 in inventory costs and Lanigan will only need 1p. Apart from these costs the profit figures reflect the cash flows. Plummer discounts at 12% and Lanigan at 11%. Which proposal has the higher NPV. Show your calculations. (15 marks)