Huger Corporation makes automotive engines. For the most recent month, budgeted production was 6,900 engines. The budgeted power cost is $5.10 per machine-hour. The company's standards indicate that each engine requires 7.5 machine-hours. Actual production was 7,000 engines. Actual machine-hours were 53,240 machine-hours. Actual power cost totaled $247,598. Required: Determine the rate and efficiency variances for the variable overhead item power cost and indicate whether those variances are unfavorable or favorable.