From the following mutually exclusive alternatives, select the best one using the B / C ratio, if the TMAR is 10% per year and the projects have a useful life of 15 years. Treat maintenance costs as a profit. Make an analysis of individual investment and extraordinary investment method B / C

1 2 3 4 6 7 5 255000 250000 190000 240000 265000 240000 265000 Initial invesment Annual maintenance Costs annual income 16000 14000 15000 52000 17000 50000 18000 81000 13000 77000 12000 45000 49000 68000 1 2 3 4 6 7 5 255000 250000 190000 240000 265000 240000 265000 Initial invesment Annual maintenance Costs annual income 16000 14000 15000 52000 17000 50000 18000 81000 13000 77000 12000 45000 49000 68000