Short of Cash

A man phoned his daughter to ask her to buy a few things he needed for a trip. He told her she would find enough dollar bills for the purchases in an envelope on his desk. She found the envelope with 98 written on it.

In a store she bought $90 worth of things, but when it was time to pay she not only didn’t have $8 left over but she was short. By how much was she short of cash, and why?

Answer

She was short of $4. She had read 86 upside down.

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