CWB Inc.'s standard cost card for direct labor and variable manufacturing overhead are as follows:
Direct Costs	Standard Quantity (unit: hours)	Standard Price (unit:$ per hour)
Direct Labor	0.1	10
Manufacturing Overhead	0.1	6
Actual results were as follows:
The number of units sold and produced was 12000 units.
The variable overhead cost was $5000 for 1000 hours.

Calculate the following variances.

Use "U" to indicate "Unfavorable" and "F" to indicate "Favorable". For example, input "3000U" for $3,000 unfavorable variance and "3000F" for $3,000 favorable variance. Do not use a thousand separator "," and do not leave space between the number and the letter U/F in your answer.

1. Variable overhead rate variance.

2. Variable overhead efficiency variance.