介绍:
"john,"said his teacher,"if coal is selling at ＄60 a ton and you pay your dealer ＄240,how many tons will he bring you?"
"A little over three tons,sir."said John promptly.
"Why ,John,that isn't right ."said the teacher.
"No ,Madam ,I known it isn't,"said John, "but they all do it."
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