16 year old getting caught with one fake note what are the consquences

Im 16 and at the bus stop I had a 50 pound note which my mum gave me n was handed change by a random person with 2 20's and 1 ten. I went to a shop and they told me it was fake so I decided to get change for one n the other one I got caught with as the guy told the teacher n they found it on me. What could happen ? I have returned the 20 pound to the person I owed.
Asked Jan 25, 2014
Fake money? You should report the person who gave you it.
Answered May 02, 2014

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