Crane's Environmental Consulting Service LLP had the following operating results last month: Service revenues amounted to $53,000, variable costs were $24,910, and fixed costs were $10,600 for the month. Based on this information, compute the following amounts: a. Total contribution margin Contribution margin ratio b. Operating income c. Degree of operation leverage (Round answer to 3 decimal places, e.g. 5.250.) d. Break-even point in dollars (Round answer to 0 decimal places, e.g. 5,275.)