The Static Budget,at the Beginning of the Month,for Onyx Décor

The static budget,at the beginning of the month,for Onyx Décor Company,follows: Static budget:
Sales volume: 1,100 units; Sales price: $70.00 per unit
Variable costs: $32.00 per unit; Fixed costs: $38,000 per month
Operating income: $3,800
Actual results,at the end of the month,follows:
Actual results:
Sales volume: 980 units; Sales price: $75.00 per unit
Variable costs: $35.00 per unit; Fixed costs: $34,200 per month
Operating income: $5,000
Calculate the flexible budget variance for sales revenue.

A) $5,760 U
B) $5,760 F
C) $4,900 U
D) $4,900 F