The estimated future market values and M&O costs for the following defender and challenger are shown below. We are interested only in what happens over the next three years. If the defender is to be replaced, it must be done now or kept in-place for the 3 years. If i=10%/year and 3-year study period, determine whether or not the challenger is economically advantageous now. Defender Challenger Year Market Vale, $ M&O Cost, $ Market Value, $ M&O Cost, $ 0 40,000 80,000 1 32,000 -5,000 65,000 -37,000 2 23,000 -5,000 39,000 -37,000 3 11,000 -5,000 20,000 -37,000 4 19,000 -38,000 5 11,000 -39,000 Replace the defender now Keep the defender for another year Replace the defender after two years replace the defender after 3 years