The Dinkle and Frizell Dental Clinic provides both preventive and orthodontic dental services. The two owners, Reese Dinkle and Anita Frizell, operate the clinic as two separate investment centers: Preventive Services and Orthodontic Services. Each of them is in charge of one of the centers: Reese for Preventive Services and Anita for Orthodontic Services. Each month, they prepare an income statement for the two centers to evaluate performance and make decisions about how to improve the operational efficiency and profitability of the clinic. Recently, they have been concerned about the profitability of the Preventive Services operations. For several months, it has been reporting a loss. The responsibility report for the month of May 2020 is shown below. Actual Difference from Budget Service revenue $40,000 $1,000 F 100 U 100 U 5,000 3,900 1,900 2,500 350 F -0- 500 110 U 13,800 40 F Variable costs: Filling materials Novocain Supplies Dental assistant wages Utilities Total variable costs Fixed costs: Allocated portion of receptionist's salary Dentist salary Equipment depreciation Allocated portion of building depreciation Total fixed costs Operating income (loss) 200 U 3,000 9,800 6,000 400 U -0- 1,000 U 15,000 33,800 $ (7,600) 1,600 U $560 U In addition, the owners know that the investment in operating assets at the beginning of the month was $82,400, and it was $77,600 at the end of the month. They have asked for your assistance in evaluating their current performance reporting system. Write a memo to the owners discussing the deficiencies of their current reporting system