A store sells cooking oil of two different brands in bottles of the same size. The table below and the equation each show the price (y), in dollars, of different number of bottles of oil (x):

Brand A
Number of Bottles, x Price (dollars), y
2
24
3
36
4
48
5
60
Brand B
y = 15x

How many dollars more is the price of 9 bottles of brand B oil than the price of 9 bottles of brand A oil? (5 points)

a
$3

b
$9

c
$27