这数学怎么做？
supposeyouownacardshop.youbuyonelineofcardsatarateof4cardsfor$5.Youplantosellthecards...
suppose you own a card shop. you buy one line of cards at a rate of 4 cards for $5. You plan to sell the cards at a rate of 3 cards for $. How many cards must you sell in order to make a profit of $100.
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100/(3-5/4)
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