PET Test - Wrong anwser

[Ubuntu-user]

Just a heads up:

Q19 - The Underground is cheaper than taxis
Taxis are more expensive than the Underground
Taxis are less expensive than the Underground

I'm not sure why, but the answer sheet is wrong:

Q19 - The Underground is cheaper than taxis
Taxis are more expensive than the Underground
Taxis are less expensive than the Underground

[Tdol]

Thanks, Ubu-User.