The Charles Schwab Corporation (SCHW) is one of the more innovative brokerage and financial service companies in the United States. The company provided information about its major business segments as follows (in millions) for a recent year. Investor (Retail) Services Advisor Services Revenues $4,173 $2,822 Operating income before taxes 1,210 469 Depreciation and amortization 131 64 a. How do you believe Schwab defines the difference between the segments? The "Investor (Retail) Services" segment serves the retail customer and the "Advisor Services" segment includes services for corporate or pension funds. b. All of the following would be considered to be variable costs in the "Investor (Retail) Services" segment except: Depreciation on brokerage offices. C. Estimate the contribution margin for each segment assuming that depreciation and amortization are the only fixed assets incurred. Investor Advisor (Retail) Services Services Operating income before taxes Plus depreciation and amortization Estimated contribution margin d. If Schwab decided to sell its "advisory services" accounts to another company, estimate how much operating income would decline. Assume that the fixed costs that serve advisory services (computers, servers, and facilities) would not be sold but would be used by the other sector. million