Sprint Nextel is one of the largest digital wireless service providers in the United States. In a recent year, it had approximately 32.5 million direct subscribers (accounts) that generated revenue of $35, 345 million. Costs and expenses for the year were as follows (in millions) Assume that 70% of the cost of revenue and 30% of the selling, general, and administrative expenses are variable to the number of direct subscribers (accounts). a. What is Sprint Nextel 's break-even number of accounts, using the data and assumptions given? Round units (accounts) and per-account amounts to one decimal place. b. How much revenue per account would be sufficient for Sprint Nextel to break even if the number of accounts remained constant