A 40-pound bag of dog food costs $38. How much does the dog food cost per pound?

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Ineed to know the answer to this algebra question.

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50