Neco 2019 Commerce Question 13

An advertising agency plans a campaign using two media: TV and radio. A 30‑second TV spot costs \(\text{₦}150,000\) and reaches 1.2\,million viewers per airing. A 60‑second radio spot costs \(\text{₦}30,000\) and reaches 0.5\,million listeners per airing. The target audience size is 4\,million people. One GRP equals one percent of the target audience. The client requires at least \(100\\%\) GRPs in total and at least \(20\\%\) of the total GRPs must come from TV. The agency may purchase any whole number of TV and radio spots. Determine the number of TV spots and radio spots that meet the requirements at the minimum total cost, and state that minimum cost (in naira).