Shown as follows is a segmented income statement for Dreer-Hall during the current month. Profit Centers Sales Variable costs Contribution margin Traceable fixed costs: controllable Performance margin Traceable fixed costs: committed store responsibility margin Common fixed costs Income from operations Drexel-Hall Store 1 Store 2 Store 3 Dollars % Dollars % Dollars % Dollars % $1,800,000 100% $600,000 100% $600,000 100% $600,000 100 % 1,080,000 60 372,000 62 378,000 63 330,000 55 $ 720,000 40% $228,000 38% $222,000 37% $270,000 45 % 432,000 24 120,000 20 102,000 17 210,000 35 $ 288,000 16% $108,000 18% $120,000 20% $ 60,000 10 % 180,000 10 48,000 8 66,000 11 66,000 11 $ 108,000 6% $ 60,000 10% $ 54,000 9% $ (6,000) (1)% 36,000 2 $ 72,000 4% All stores are similar in size, carry similar products, and operate in similar neighborhoods. Store 1 was established first and was built at a lower cost than were Stores 2 and 3. This lower cost results in less depreciation expense for Store 1. Store 2 follows a policy of minimizing both costs and sales prices. Store 3 follows a policy of providing extensive customer service and charges slightly higher prices than the other two stores. Top management of Dreer-Hall is considering closing Store 3. The three stores are close enough together that management estimates closing Store 3 would cause sales at Store 1 to increase by $75,000, and sales at Store 2 to increase by $97,000. Closing Store 3 is not expected to cause any change in common fixed costs. Compute the increase or decrease that closing Store 3 should cause in: a. Total monthly sales for Dreer-Hall stores. b. The monthly responsibility margin of Stores 1 and 2. c. The company's monthly income from operations