Brief exercise 18-12 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 $40,000; design $300,000; and construction oversight $100,000. the cost drivers and expected use are as follows. activities cost drivers expected use of cost drivers per activity initial concept formation number of project changes 20 design square feet 150,000 construction oversight number of months 100 (a) compute the predetermined overhead rate for each activity. (round overhead rate per square foot to 2 decimal places, e. g. 2.25 and all other answers to 0 decimal places, e. g. 1,225.) overhead rate initial concept formation $ per project change design $ per square foot construction oversight $ per month (b) classify each of these activities as unit-level, batch-level, product-level, or facility-level. activities level initial concept formation design construction oversight