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Ben earns 20c for every card he sells. When he sells a whole box of 12 cards he earns an extra $2.
How many cards does he need to sell to earn $332.
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According to the problem, Ben earns 12*20 cents PLUS 2 dollars = 4.40 dollars for every box of 12 cards sold.
So we divide $332 by $4.40 to get
= 75.4545...
We round this value to the closest integer number, which is less than 75.4545..
This value is 75, which means that Ben should sell 75 boxes.
He will earn then $4.40*75 = $330.
So, Ben should sell 75 boxes of 12 cards each PLUS 10 additional separate cards.
The total number of card sold is then 75*12 + 10 = 910. ANSWER
Solved and thoroughly explained.