Answer: Let R = number of radio ads placed
N = number of newspaper ads placed
Maximize 2000R + 6000N
Subject to: R + N ≥ 15
400R + 600N ≤ 7200
R ≥ 2
N ≥ 2
R, N ≥ 0
Feasible corner points (R,N): (9,6) (13,2) (15,2)
Maximum exposure 54,000 with 9 radio and 6 newspaper ads.