The following is monthly budgeted cost and activity information for two activities in the purchasing department of X Company:

Activity	Variable Costs	Fixed Costs	Cost Driver
Supplier relations	$9,250	$16,400	370 suppliers
Invoicing	$8,470	$23,100	770 invoices

In November, actual costs and activity were as follows:

Activity	Total Costs	Driver Amount
Supplier relations	$26,236	409 suppliers
Invoicing	$30,050	721 invoices

What was the flexible budget variance for the invoicing activity for November (assume that favorable variances are positive numbers and unfavorable variances are negative numbers)?

A: $-22,119

B: $-21,580

C: $-6,950

D: $0

E: $981

F: $1,520