Re: 9/10 of a cent
Here are two ideas I thought up.
Because almost no one buys gasoline one gallon at a time, they can get a few extra cents out of each customer. So the 9/10 will actually matter.
Also, the calculation of purchase cost is automated, so it's not more complicated to have extra tenths of cents. It would be harder at a grocery store where you'd have to have nonstandard cash registers.
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