Silly What if question. Ethics? Greed?

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Old blind guy wants to buy a lottery ticket for a dollar (don't ask me how he got there). He is sure his numbers will hit this week. He goes to give the cashier 100 dollar bill and the cashier explains he can't accept it after hours. The cashier barely speaks english and can't communicate the problem to the blind guy. After some time they both get louder, though not any clearer.

The blind guy doesn't understand all he has is a single 100 dollar bills in his wallet. He thought it was a one dollar bill. To further complicate matters the lottery machine closes in 5 mins and the old guy wants what he wants. You are one of the few in the store at the time and in a position to help him. You go up to him and say you can help, What do you offer to do for him?

Give him 100 dollars in change?

Give him 65 dollars in change (typical flipper)

Give him 55 dollars in change (able to wholesale to a flipper)

Do you Exchange the bill for a single?

Buy the ticket for him and offer to split the proceeds?

Do you even bother to tell him it's 100 dollars?

I have questions...who has answers?