Alexa and Emily open up a lemonade stand in the front yard. They spent $10 for lemons, $5 for sugar and $3 for cups. The lemonade is $4 a cup. They sell a total of 21 cups. How much profit did Alexa and Emily make after paying off expenses? Think carefully first, then make a decision:
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Alexa and Emily spend a total of $10 + $5 + $3 = $18. They make a total of $4 x 21 = $84. They make a profit of $84 - $18 = $66. So, the answer is 66.
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