BE17.12 (LO 3, 4), AP Spin 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 $40,000, design $300,000, and construction oversight $100,000. 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