Raven Company applies overhead based on direct labor hours. The variable overhead standard is 2 hours at $11.00 per hour. During July, Raven spent $107,569 for variable overhead, and 8,890 labor hours were used to produce 4,700 units. What is the variable overhead rate variance? '31, a} $5,170 unfavorable 'i, :3' b) $9,779 favorable {1:} c) $9,779 unfavorable '31, d) $19,558 unfavorable