Developing an Equation from Average Costs Tucker Pup's Pet Resort offers dog boarding services in Chicago. Assume that in March, when dog days occupancy was at an annual low of 150 days, the average cost per dog-day was $65. In July, when dog days were at a capacity level of 600, the average cost per dog-day was $20. (a) Develop an equation for monthly operating costs. Total costs (b) Determine the average boarding cost per dog-day at an annual volume of 4.500 dog-days. 50 Support Check