On a coordinate grid, the coordinates of vertices P and Q for polygon RQRS are P(1, 2) and Q(-1, 2)

1) If 6 ounce bottles of Brand A  salad dressing costs= $1.56

Cost of 1 ounce bottle= $1.56÷6

Here , cost of one ounce Bottle= $0.26

2) if 14 -ounce bottle costs= $3.36

Cost of 1 ounce bottle= $3.36÷14

Here , cost of one ounce Bottle= $0.24

3) if 20 -ounce bottle costs= $5.60

Cost of 1 ounce bottle= $5.60÷20

Here , cost of one ounce Bottle= $0.28

Hence, the best price is $0.24 per ounce

Hence, we should buy 14 ounce bottle costs $3.36