Question: The manager of a discount clothing store received 2 shipments of Fall clothing. The cost of the first shipment which contained 10 identical sweaters and 20 identical jackets was 800 dollars. The second shipment at the same prices , contained 5 of the same sweaters and 15 of the same jackets. The second shipment was 550 dollars. Find the cost of 1 jacket , in dollars.
Answer: 30