1970's A Farmer Sells A Bag Of Potatoes For $10. His Costs Amount To 4/5 Of His Selling Price, I.

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1970's
A farmer sells a bag of potatoes for $10. His costs amount to 4/5 of his
selling price, i.e. $8. What is his profit?
-- from: The evolution of mathematics education during the last 30 years.

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