help with homework

[the_last]

print("Sales Tax Calculator")
print("")
print("ENTER ITEMS (ENTER 0 TO END)")

cost_of_item = float(input("Cost of item: "))

while(cost_of_item > 0):
    print()
    print("Cost of item: ", cost_of_item)

issue with this code is that the results are infinite. I want to have separate instances as shown in the image.