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The table below shows the short-run production function for Michelle's Accounting Company. Number of Bookkeepers Total Product per Hour 1 8 20 4O 55 65 7O 65 55 mNmUIhWN (a) After which bookkeeper do diminishing marginal returns begin for Michelle's Accounting Company? Explain using numbers. (b) Assume Michelle's Accounting Company sells its accounting services in a perfectly competitive market at a price of $20. Calculate the marginal revenue product of the sixth bookkeeper. Show your work. (c) Michelle's Accounting Company hires bookkeepers in a perfectly competitive labor market for bookkeepers at a wage rate of $11 0 per hour, and the market price of services remains $20. How many bookkeepers will Michelle's Accounting Company hire to maximize its prot? Explain using marginal analysis. (d) Assume bookkeepers and accounting software are substitutes in providing accounting services by all accounting rms in the market. If accounting software, a xed input, becomes less expensive and Michelle's Accounting Company provides the same quantity of accounting services, will each of the following increase, decrease, or stay the same? (i) The wage rate Michelle's Accounting Company will pay its bookkeepers. Explain. (ii) The demand curve for bookkeepers for Michelle's Accounting Company. Explain