SOLUTION: 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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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?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
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Cost per cookie=$4/5=$0.80
Price per cookie=$5/4=$1.25
Profit per cookie=Price-Cost=$1.25-$0.80=$0.45
David made $0.45 per cookie.
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$90/$0.45=200
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ANSWER:David purchased (and sold) 200 cookies to make a $90 profit.