T-Mobile US, Inc. (TMUS) is one of the largest digital wireless service providers in the United States. In a recent year, it had 102.1 million subscribers (accounts) that generated service revenue of $50,395 million. Costs and expenses for the year were as follows (in millions): Assume that 30% of the cost of revenue and 70% of the selling, general, and administrative expenses are fixed to the number of direct subscribers (accounts). In part (a) and (b), round all interim calculations and final answers to one decimal place. a. What is T-Mobile's break-even number of accounts, using the data and assumptions given? million accounts b. How much revenue per account would be sufficient for T-Mobile to break even if the number of accounts remained constant? milion per account