In the month of June, Cullumber Spa served 515 clients at an average price of $130. During the month, fixed costs were $22,880 and variable costs were 60% of sales. (a) Determine the contribution margin in dollars, per unit, and as a ratio. eTextbook and Media Attempts: 0 of 2 used (b) The parts of this question must be completed in order. This part will be available when you complete the part above