please assist

The PW of the ATCFs through year k, PW, for a defender (three-year remaining useful life) and a challenger (five-year useful life) are given in the table provided. Assume the after-tax MARR is 10% per year. On the basis of this information, answer the following questions: a. What are the economic life and the related minimum EUAC when k = NAT , for both the defender and the challenger? b. Assume an infinite analysis period with repetitive cycles of replacement with challenger (every three years) starting at the end of the second year. When should the challenger (based on the present analysis) replace the defender? Click the icon to view the table for PW of the ATCFs through year k, PWk, for a defender and a challenger. Click the icon to view the interest and annuity table for discrete compounding when MARR = 10% per year. a. The economic life for the defender is | | year(s). (Round to the nearest whole number.) The corresponding minimum EUAC value is $ . (Round to the nearest dollar.) The economic life for the challenger is | year(s). (Round to the nearest whole number.) The corresponding minimum EUAC value is $ . (Round to the nearest dollar.) b. Choose the correct statement below. O A. The defender should be replaced after the apparent economic life. O B. The defender should be kept longer than the apparent economic life as long as its marginal cost exceeds the average EUAC for the best challenger. O C. The defender should be kept longer than the apparent economic life as long as its marginal cost is less than the minimum EUAC for the best challenger. O D. The defender should be kept longer than the apparent economic life as long as its average cost exceeds the minimum EUAC for the best challenger. Based on the PW analysis, the defender should be kept for |1 year(s) before being replaced by the challenger. (Round to the nearest whole number.) Click to select your answer(s). d. ta Discrete Compounding; i= 10% ge Single Payment Uniform Series Im Compound Compound Sinking Capital thl Amount Present Amount Present Fund Recovery ICH Factor Worth Factor Factor Worth Factor Factor Factor To Find F To Find P To Find F To Find P To Find A To Find A ch Given P Given F Given A Given A Given F Given P N F/P P/F F/A P/A A/F A/P 1. 1000 0.9091 1.0000 0.9091 1.0000 1. 1000 1.2100 0.8264 2. 1000 1.7355 0.4762 0.5762 re 1.3310 0.7513 3.3100 2.4869 0.3021 0.4021 1.4641 0.6830 4.6410 3. 1699 0.2155 0.3155 1.6105 0.6209 6. 1051 3.7908 0. 1638 0.2638 5 0 V O UT A W N - 1.7716 0.5645 7.7156 4.3553 0. 1296 0.2296 1.9487 0.5132 9.4872 4.8684 0. 1054 0.2054 2.1436 0.4665 11.4359 5.3349 0.0874 0. 1874 2.3579 0.4241 13.5795 5.7590 0.0736 0. 1736 2.5937 0.3855 15.9374 6. 1446 0.0627 0. 1627 11 2.8531 0.3505 18.5312 6.4951 0.0540 0. 1540 12 3. 1384 0.3186 21.3843 6.8137 0.0468 0. 1468 13 3.4523 0.2897 24.5227 7. 1034 0.0408 0. 1408 14 3.7975 0.2633 27.9750 7.3667 0.0357 0.1357 15 4.1772 0.2394 31.7725 7.6061 0.0315 0. 1315