The tables show the cost of different numbers of t-shirts ordered at two different stores, Store P and Store Q:


Store P


Number

of T-shirts Cost (in $)

3 $18

6 $36

9 $54



Store Q


Number

of T-shirts Cost (in $)

2 $10

4 $20

8 $40



Which of these explains which store has a better buy?

Store Q, because the ratio of the number to the cost is 1:6 in Store P and 1:5 in Store Q

Store Q, because the ratio of the number to the cost is 6:1 in Store P and 5:1 in Store Q

Store P, because the ratio of the number to the cost is 3:21 in Store P and 2:12 in Store Q

Store P, because the ratio of the number to the cost is 21:3 in Store P and 12:2 in Store Q