Cholla Company's standard foxed overhead rate is based on budgeted fixed manufacturing overhead of $10,900 and budgeted production of 37,000 units. Actual results for the month of October reveal that Cholla produced 31,000 units and spent $10.800 on fixed manufacturing overhead costs. Required: Calculate Cholla's fixed overhead spending variance. Note: Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance)