Formidable Company Collected the Following Information: Standard Costs Per Unit

Formidable Company collected the following information: Standard costs per unit:
Variable overhead 4 machine hours @ $6 per machine hour
Fixed overhead 4 machine hours @ $10 per machine hour
Actual output 20,000 units
Denominator (normal capacity) output 21,000 units
Actual machine hours 79,000 machine hours
Actual variable overhead cost $540,000
Actual fixed overhead cost $810,000
Using the three variance method, what is the spending variance?

A) $36,000 (F)
B) $30,000 (U)
C) $36,000 (U)
D) $30,000 (F)