The tables show the cost of different numbers of t-shirts ordered at two different stores, Store P and Store Q: Store P
Number
Cost
of T-shirts (in $)
3 $18
6 $36
9 $54

Store Q
Number
Cost of T-shirts (in $)
2 $10
4 $20
8 $40

Which of these explains which store has a better buy?
а
Store Q, because the ratio of the number to the cost is 1:6 in Store P and 1:5 in Store Q
b
Store Q, because the ratio of the number to the cost is 6:1 in Store P and 5:1 in Store Q
c
Store P, because the ratio of the nu er to the cost is 3:21 in Store P and 2:12 in Store Q
d
Store P, because the ratio of the number to the cost is 21:3 in Store P and 12:2 in Store Q