By Nathaniel Meyersohn | CNN Business
As gas prices continue to rise, drivers are angrily glaring up at pump price boards each time they fill up their tanks.
The average national price Tuesday was a little under $5.02 per gallon, according to AAA. Prices are even higher in some states. California had the nation’s highest average price of $6.44 a gallon.
But why does the price of a gallon of gas always end in 9/10 of a cent on stations’ price boards? No other retailers advertise their prices in fractions of a cent. Pennies are so worthless these days that people even throw them away or leave them on checkout
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