I’ll really appreciate it if you help me out on this one .

the cost increases $0.30 each time 1 goldfish is added

Step-by-step explanation:

1.50/5= 0.30

3.00/10= 0.30

4.50/15= 0.30

6.00/20= 0.30

A

Step-by-step explanation:

This is because from the data we can tell its increasing 1.50$ per 5 goldfish.

1.50/5=.30