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4 pastries cost 10 dollars so how many do 9 cost

User Sdlins
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If it costs $10 to buy 4 items we divide 10 by 4 which equals to $2.50 each pastry. 2.50 times 9 is 22.5 therefore if you were to buy 9 pastries, your total will be $22.50
User Dallan Quass
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