Based on the calculations, the medium that provides the lowest CPM is the cable commercial.
Since the radio commercial costs $600 and reaches an estimated 10,250 listeners, the CPM will be:
= $600/10250
= $0.0585
Since the local cable commercial costs $1000 and reaches an estimated 18,500 viewers, its CPM will be:
= $1000 / 18500
= $0.0541
Therefore, the lowest CPM is gotten from the cable commercial.
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