Bill the miner discovers a vein of fool's gold. He successfully sells 8 ounces to a merchant, but when he tries to sell to the sheriff he's arrested, fined $50 and run out of town on a rail. If Bill earned $9 for every ounce of fool's gold he sold, how much money is he left with? Let's be accurate as possible.
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First find the total amount of money Bill made from the merchant: 8 ounces * $9 / ounce = $72. Then subtract the fine to find how much money he was left with: $72 - $50 = $22.
The answer: 22.
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