P 6-19: Madigan Modems Madigan produces a single high-speed modem. The following table summarizes the current month's budget for Madigan's modem production: Projected production and sales 4,000 units Variable costs $640,000 Fixed costs $480,000 Total production budget $1,120,000 Actual production and sales for the month were 3,900 units. Total production costs were $1,114,800, of which $631,800 were variable costs. Required: a. Prepare an end-of-month variance report for the production department using the beginning-of-month static budget. b. Prepare an end-of-month variance report for the production department using the beginning-of-month flexible budget. c. Write a short memo evaluating the performance of the production manager based on the variance report