answer is 18,648 how to work it out and get the answer

Johnson Co. makes organic non-GMO vegetable seed packets for the chef/gardener market. The standard labor to count and assemble each packet is 0.28 hours at a cost of $16.65 per hour. Johnson Co. budgeted to make 65,000 seed packets but due to high demand, they ended up making 70,000 packets. They paid $316,008 for 18,480 hours of packet assembly time. What is their labor efficiency variance for this period? Enter a favorable variance is a positive number and an unfavorable variance as a negative number. Enter as a whole number, no commas and no dollar signs