11 The annual worth for the challenger if retained for 4 years, which is its ESL, is closest to: AS-21.329/year, 5-23.420/year CS-30,574/year. 05:35,211/year. 12. From an economic point of view, The defender should be replaced: A Now 8. After 1 year from C. After 2 years from now. D. After 3 years from now. now. B (1.5) b.c