Grawburg Inc. maintains a call center to take orders, answer questions, and handle complaints. The costs of the call center for a number of recent months are listed below: April May June July August September October November Calls Taken 6,781 6,750 6,791 6,787 6,757 6,767 6,809 6,793 Call Center Cost $ 73,515 $ 73,313 $ 73,584 $ 73,535 $ 73,368 $ 73,412 $ 73,683 $ 73,579 Management believes that the cost of the call center is a mixed cost that depends on the number of calls taken. Required: Estimate the variable cost per call and fixed cost per month using the least-squares regression method. (Round the "Variable cost" to 2 decimal places and the "Fixed cost" to the nearest dollar amount.) per call Variable cost Fixed cost per month