Ron Lee, a marketing clerk for Star Agency, recorded the following information for last year: Month January February March April May June July August September October November December Number of Customers 342 403 320 498 386 443 352 481 331 500 429 401 Customer Service Costs $ 525, 063 542, 165 479, 505 660, 350 528, 400 654, 810 542, 090 679,000 485, 550 681, 825 626, 930 540, 600 He would like to be able to estimate customer service costs using the number of customers as the basis for estimation. However, because he has never taken a course in managerial accounting, he does not know how to set up a cost equation. He has therefore approached you for help. Required: 1. Set up a cost equation for monthly customer service costs using the high-low method. S 1,123 X 2. Using the equation from part (1), compute the estimated customer service costs if the number of customers is expected to be 560. Customer service costs 2. Using the equation from part (1), compute the estimated customer service costs if the number of customers is expected to be 560. Customer service costs 3. You also used the least-squares regression method to do the analysis of the costs; the analysis resulted in the following output: Intercept: Coefficient of X-variable: Adjusted R square: 121, 234.03 1, 123.92 0.90 Set up a cost equation using the above numbers. (Round the "Fixed cost" to the nearest dollar amount and "Variable cost" to 2 decimal places.) Y =