Let each magazine cost 1 unit. Then each book costs 2 units.<br><br>
Books : Magazines (count) = 5 : 4.<br>
Total cost of books = 5 × 2 = 10 units.<br>
Total cost of magazines = 4 × 1 = 4 units.<br><br>
Ratio of total cost = 10 : 4 = 5 : 2 = 2.5 times.<br><br>
Final Answer: 2.5