The Gleaming Company has just developed a new dishwashing liquid and is preparing for a national television promotional campaign. The firm has decided to schedule a series of 1-minute commercials during the peak homemaker audience viewing hours of 1 to 5 p.m. To reach the widest possible audience, Gleaming wants to schedule one commercial on each of four networks and to have one commercial appear during each of the four 1-hour time blocks. The exposure ratings for each hour, which represent the number of viewers per $1,000 spent, are presented in the following table. Which network should be scheduled each hour to provide the maximum audienceexposure?

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NETWORK VIEWING HOURS A B C INDEPENDENT 1-2 P.M. 2-3 PM. 34 Р.М. 4-5 P.M. 27.1 18.1 11.3 18.9 15.5 17.1 19.2 18.5 9.9 115 21.4 16.8 9.5 10.6 7.7 12.8