43. A city currently emits 16 million gallons (MG) of raw sewage into a lake that is beside the city. Table 12.13 shows the total costs (TC) in thousands of dollars of cleaning up the sewage to different levels, together with the total benefits (TB) of doing so. Benefits include environmental, recreational, health, and industrial benefits. TC TB 16 MG Current Current 12 MG 50 800 8 MG 150 1300 4 MG 500 1850 httpe./nonetav pra/hankerineinlas-mirnaronnmine-?aanae/12-nrohlame