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Q. In 2005, Bob's Burgers charged $1.50 for a quarter-pound hamburger with all the fixin's, and sold 7,500 of them. In 2006, although Bob raised the price to $1.75, sales of quarter-pound burgers rose to 8,200. Discuss why this does not represent a violation of the law of demand.
Q. The number of parts produced per hour by a worker is given by N=4+3t^2-t^3 where t is the number of hours on the job without a break. If the worker starts at 7 A.M., when will she be at a maximum productivity?