2 Bargain Rental Car offers rental cars in an off airportkocation near a major towrist destic nation in California. Management would like to better understand the portions of it car washing costs. The company operates its own car to another compiled: variable and fixed wash facility in which rental car that is returned is thoroughly cleaned before being released for rental customer. Management believes that the variable portion of its car washing to the number of rental returns. Accordingly, the following data have been -costs relates Car Wash Costs $10,825 11,865 $11,332 $12,422 $13,850 $14,419 $14,935 Rental Returns January 2,380 2,421 2,725 2,968 .281 3,353 3,489 3,057 2,876 2,735 2,983 May June. .. 15,738 $13,563 $11,889 $12,683 $13,796 August October.... December