investment in sitive and/or negative? (6 b) You have been asked to evaluate 2 pollution control dences. The wet scrub costs $100 to set up and $50 per year to operate. It must be completely replaced every 3 years, and it has no salvage value. The dry scrub device costs $200 to set up and $30 per year to operate. It lasts for 5 years and has no salvage value. Assuming that pollution control equipment is replaced as it wears out, which method do you recommend if the cost of capital is 10 percent? (8 marks) F TIH