Would you keep the extra change or would you tell the cashier?

I was shopping and had to pay £130. I gave the cashier £200 then I found an extra £30 so I gave her that as well so she could give me £100 back. She handed me £150. I told her she gave me too much change and it took her like 5 minutes to figure out what she did wrong like omg it’s simple maths jesus christ 🙄 my SO then said he would’ve said thanks and leave. What would you do?

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