document.write( "Question 1011975: david purchased some cookies at the cost of 5 for $4 and sold them at 4 for $5. david made a profit of $90 in total. how many cookies did david purchase to make that much money?
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Algebra.Com's Answer #627801 by macston(5194)\"\" \"About 
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\n" ); document.write( "Cost per cookie=$4/5=$0.80
\n" ); document.write( "Price per cookie=$5/4=$1.25
\n" ); document.write( "Profit per cookie=Price-Cost=$1.25-$0.80=$0.45
\n" ); document.write( "David made $0.45 per cookie.
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\n" ); document.write( "$90/$0.45=200
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\n" ); document.write( "ANSWER:David purchased (and sold) 200 cookies to make a $90 profit.
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