can someone explain how this answer was found?

Johnson Co. makes organic non-GMO vegetable seed packets for the chef/gardener market. The standard material is 0.80 ounces per seed packet at a cost of $0.70 per ounce. Johnson Co. budgeted to make 65,000 seed packets but due to high demand, they ended up making 74,000 packets. They paid $42,000 for 60,000 ounces of seed and used all but 3,000 ounces of this purchase in production during the period. What is their material efficiency varlance for this period? Enter a favorable variance is a positive number and an unfavorable variance as a negative number. Answer: 1540