Read: Chapter 5 of the textbook (Heisinger, K., & Hoyle, J. B. (2012). Managerial Accounting. Creative Commons by-nc-sa 3.0. https://open.umn.edu/opentextbooks/textbooks/managerial-accounting) For the Paper: Write three complete and well-composed paragraphs (in your own words) explaining how to compute the answer to the following problem: Phan Incorporated has annual fixed costs totaling $6,000,000 and variable costs of $350 per unit. Each unit of product is sold for $500. Required: (a) Calculate the contribution margin per unit. (b) Find the break-even point in units. (c) How many units must be sold to earn an annual profit of $750,000? Be sure to use in-text citation and provide references for your sources, including textbooks.