Brief Exercise 4-12 Spin Cycle Architecture uses three activity pools to apply overhead to its projects. Each activity has a cost driver used to allocate the overhead costs to the projects. The activities and related overhead costs are as follows: initial concept formation $52,400; design $462,000; and construction oversight $116,550. The cost drivers and estimated use are as follows. Estimated Use of Cost Drivers per Activity Cost Drivers Initial concept formation Number of project changes Design Construction oversight Number of months 20 154,000 105 Square feet (a) Compute the predetermined overhead rate for each activity Overhead Rate Intial concept formation Design Construction oversight s (b) Clessify each of these activities as unt-level, betch-level, product-level, or facility-level. per project change per square foot Per month Activities Level Initial concept formation Design Construction oversight