Calculus: General Differentiation – #484

Question: Currently farmers get $10.00 per bushel for their potatoes, and after that the price drops 8 cents per bushel per day. Today a certain farmer has 510 bushels of potatoes in his field and estimates that the crop is increasing at a rate of 6 bushels per day. How many days later should the farmer harvest the potatoes to maximize his revenue?


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