Am I missing something(Cash Register Challenge)

How can this test expect a return of ‘insufficient funds’ when there is a one(1) in the cid. If I am not missing the logic, I would expect this to be ‘open’ since the change required is only 0.5.

Hello there,

The issue is that $0.5 change can not be made with 1x$1 note, and 1x$0.01 penny

Hope this clarifies

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Ok, i get it, thanks.