Question 4 5 pts 3 4 The EUAC of the challenger (New) for the economic life of 5 years is $8,500. The marginal cost of the defender (Old) for these years are in the table below. Determine when the defender should be replaced End of year 1 2 3 Later Marginal Cost, $ 7,500 8,000 8,500 9,000 Which year do you like to replace it? 1 2 3 4 Later O2 O Later 3 1 0.4