the velocity company uses flexible budgeting for cost control. Velocity made 15,300 units of products during March, incurring indirect material costs of $18,000. Its master budget reflected indirect material costs of $480,000 at a production volume of 320,000 units. What was the flexible budget variance for the indirect material costs in March?

a. $3890 favorable

b. $4,660 unfavorable

c. $3,580 unfavorable

d. $4,950 favorable