Cosi Company uses a job order costing system and allocates its overhead on the basis of direct labor costs. Cosi expects to incur $810,000 of overhead during the next period, and expects to use 51,000 labor hours at a cost of $10.00 per hour. What is Cosi Company's overhead application rate

Within the relevant range, if there is a change in the level of the cost driver, then a. total fixed costs will remain the same and total variable costs will change b. total fixed costs will change and total variable costs will remain the same c. total fixed costs and total variable costs will change d. total fixed costs and total variable costs will remain the same