Answer 1

OK. What is wrong with its functionality? What should it do, and what is it doing instead?
One thing is missing: an action if purity < 75.

Answer 2

print("22K")

Answer 3

show more in the content

Answer 4

It's incomplete. The interpreter can't guess the missing part (neither do us).

Answer 5

Seems no error, maybe lost an else statement at the end to catch other conditions?