Vitko Corporation makes automotive engines. For the most recent month, budgeted production was 6,000 engines. The standard power cost is $8.80 per machine-hour. The company's standards indicate that each engine requires 6.1 machine-hours. Actual production was 6,400 engines. Actual machine-hours were 38,730 machine-hours. Actual power cost totaled $350,628.

Required:

Determine the rate and efficiency variances for the variable overhead item power cost and indicate whether those variances are unfavorable or favorable.