I need help solving the question marks. I don't know the formulas to use.

Chapter 3: Applying Excel Data Allocation base Estimated manufacturing overhead cost Estimated total amount of the allocation base Actual manufacturing overhead cost Actual total amount of the allocation base Machine-hours $300,000 75,000 machine-hours $290,000 68,000 machine-hours Enter a formula into each of the cells marked with a ? below Computation of the predetermined overhead rate Estimated manufacturing overhead cost Estimated total amount of the allocation base Predetermined overhead rate ? ? machine-hours ? per machine-hour ? Computation of underapplied or overapplied manufacturing overhead Actual manufacturing overhead cost Manufacturing overhead cost applied to Work in Process during the year: Predetermined overhead rate Actual total amount of the allocation base Manufacturing overhead applied Underapplied (overapplied) manufacturing overhead ? per machine-hour ? machine-hours