Answer:
$12
Explanation:
First you multiply the amount of times shew went (4) by the amount of tip she left (1.50). You would get $6. Then you subtract that by the total amount (54) and you would get $48. Then you have to divide the total left over cost by the amount of times you went, and you get $12. $12 would be the amount per salad.
C = 54 - ( 1.50 x 4 ) / 4