types of pollution 8-4 A paper mill is considering two t control equipment. Neutralization Precipitation Initial cost Annual chemical cost Salvage value Useful life, in years $700,000 40,000 175,000 $500,000 110,000 125,000 (a) Construct a choice table for interest rates from 0% to 100%. (b) The firm wants a 12% rate of return on any avoidable increments of investment. Which equipment should be purchased