Top Notch Corporation has four operating divisions. The budgeted revenues and expenses for each division for 2000 follows (Click to viow the resulta of each divison) Closing down any division would resut in savings of 50 s of the fixed costs of that dision. Top management is very concemed about the unproftiable divisions (A and B) and is considering closing them for the year Requirempnts 1. Calculate the increase or decrease in operating income if Top Notch closes division A 2. Calculate the increase or decrease in operating income if Top Notch doses divion B 3. What othee factors should the top management of Top Notch consider before making a decsion? Data table Further analysis of costs reveals the following percentages of variable costs in each division: Requirement 1. Calculate the increase or decrease in operating income if Top Notch closes division A. Begin by calculating Division A's contribution margin