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14 ounce bottle

Step-by-step explanation:

6 ounce bottle :

1 ounce = 1.56÷6

             = 0.26

14 ounce bottle :

1 ounce = 3.36÷14

             = 0.24

20 ounce bottle :

1 ounce = 5.60÷20

             =  0.28

hence, the 14 ounce bottle has the lowest cost per ounce

A 6-ounce bottle of salad dressing costs $1.56 .

6 ounces = $ 1.56

1 ounce = $ ( 1.56 / 6 ) = $ 0.26

A 1-ounce bottle of salad dressing costs $0.26 .

A 14-ounce bottle of salad dressing costs $3.36 .

14 ounces = $ 3.36

1 ounce = $ ( 3.36 / 14 ) = $ 0.24

A 1-ounce bottle of salad dressing costs $0.24 .

A 20-ounce bottle costs $5.60 .

20 ounces = $ 5.60

1 ounce = $ ( 5.60 / 20 ) = $ 0.28

A 1-ounce bottle of salad dressing costs $0.28 .

A 14-ounce bottle has the lowest cost per ounce.

3

step-by-step explanation:

divide 13.5 by 9 to get the scale factor. it equals 1.5

2 * 1.5 = 3