Business Calc Question: A certain D. Kong is producing and selling bananas. Let p be the price of a bushel of bananas and let x be bushels of bananas produced. Currently, Mr. Kong has 80 bushels of bananas and the price of a bushel of bananas is $15 per bushel and is decreasing by $0.60 per week.
What rate of change in production with respect to time is required to keep Mr. Kong's revenue constant?