You need to buy some chicken for dinner tonight. You found an ad showing that the store across town has it on sale for $3.09 a pound, which is cheaper than your usual neighborhood store, which sells it for $3.59 a pound. Is it worth the extra drive?

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How much chicken will you be buying? 4 pounds
How much far are the two stores? My neighborhood store is 2.5 miles away, and takes about 8 minutes. The store across town is 8.6 miles away, and takes about 23 minutes.
How kind of mileage does your car get? It averages about 18 miles per gallon in the city.
How many gallons does your car hold? About 14 gallons
How much is gas? About $3.71/gallon right now.