A shop sells 12 tins for 9 and 6 tins for 5. To compare fairly, a buyer should work out the:

1. Different pack sizes cannot be compared on the sticker price. 2. Dividing price by number of tins puts both on the same footing. 3. That figure is the unit price. _Source: OpenStax Prealgebra 2e, Chapter 5, Decimals._