24. A cement plant ball mill emits particulate matter that must be controlled to meet provincial air pollution regulations. Three particulate matter control devices being evaluated, each of which can control these emissions to the same level, are as follows: (1) A high-energy wet scrubber (2) An electrostatic precipitator (ESP) (3) A fabric filter Unlike the wet scrubber, the ESP and the fabric filter each recover salable cement dust, and, accordingly, revenue can be attributed to these two options. The economic specifications for the three devices are as follows: Two scenarios are presented; one with an after-tax hurdle rate of 6% and the other with an after-tax hurdle rate of 18%. For each of the two scenarios, determine the most economical particulate matter control device to control dust from the ball mill using equivalent uniform annual revenue (EUAR) analysis