If a bottle and a stopper cost $1.10. How much does the stopper cost?

Answer 1

Insufficient information.

Answer 2

I know that's the first thing that comes to mind, but my teach said that it can be done. He said that the answer is $0.05, so if someone can work backwards somehow and explain to me how he arrived at that answer I would appreciate it. :)

Answer 3

1.10/2 = 0.55/1.10 = 0.5/10 = 0.05