A company has just developed a new item for which it proposes to undertake a national television promotional campaign. It has decided to schedule a series of one-minute commercials during peak audience viewing hours of 1 to 5 P.M. To reach the widest possible audience, the company wants to schedule one commercial on each of the networks and to have only one commercial appear during each of the four onehour time blocks. The exposure ratings for each hour, which represent the number of viewers per Rs 10,000 spent, are given below.

(a) Which network should be scheduled each hour to provide the maximum audience exposure?

(b) How would the schedule change if it is decided not to use network A between 1 and 3 P.M.?

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Viewing Hours Network A B C D 1-2 P.M. 27.1 18.1 11.3 9.5 2-3 P.M. 18.9 15.5 17.1 10.6 3-4 P.M. 19.2 18.5 9.9 7.7 4-5 P.M. 11.5 21.4 16.8 12.8