A student was given a sum of 20 naira to buy economic textbook, the textbook value 10 naira. 2 80 leaves 2 naira each, 1 pen 0.50 naira, a pencil 0.50 naira, a ruler 0.50 Naira and a small radio recorder 100, a tennis racket 90 Naira, a school uniform 3,50 naira

Arrange the items in the order of their importance or scale of preference