3. Within the relevant range of activity, costs: a. can be estimated with reasonable accuracy. b. exhibit decreasing marginal cost patterns. c. exhibit increasing marginal cost patterns. d. None of the given answers. 4. For a fixed cost, as volume increases: a. the cost behaviour depends on the type of fixed cost involved b. total fixed costs remain constant and fixed costs per unit increase both total fixed costs and fixed costs per unit remain constant d. total fixed costs remain constant and fixed costs per unit decrease 5. The estimates used to calculate the predetermined overhead rate: a. will generally prove to be incorrect to some degree b. will usually result in a non-zero balance left in the manufacturing overhead account at the end of the year are likely to result in either overd/pplied or underapplied overhead d. All of the given answers C