Blue Spruce Cycle Architecture uses three activity pools to apply overhead to its projects. Each activity has a cost driver used to assign the overhead costs to the projects. The activities and related overhead costs are as follows: initial concept formation $40,020; design $292,000; and construction oversight $118,450. The cost drivers and estimated use are as follows. Activities Cost Drivers Estimated Use of Cost Drivers per Activity Initial concept formation Number of project changes 23 Design Square feet 146,000 Construction oversight Number of months 115 (a) Compute the predetermined overhead rate for each activity. Initial concept formation $ Overhead Rate per project change per square foot Design Construction oversight $ Per month