10) which has the lowest price per ounce?
refer to the chart above < 3

The lowest price per once is: "Don's store" $ 0.101

Step-by-step explanation:

You have to apply a 3 way rule

so:

1) 60 oz $6.50

1 oz     =(1 oz X $6.50)/ 60

                = $0.108

2) 54 oz $5.50

    1 oz     =(1 oz X $5.50)/ 54

                = $0.101

3) 48 oz $5.61

      1 oz     =(1 oz X $5.61)/ 48

                = $0.116

4) 40 oz $4.50

      1 oz     =(1 oz X $4.50)/ 40

                = $0.112

Greetings

true? is that what you're asking or do you mean something else?