5) What is the main idea of this passage? A) In order to help preserve and protect our environment, builders should construct more "green" buildings. B) One way a building can be more green is by the use of passive solar heating to decrese the use of electricity. C) Reducing the amount of fresh water used in building is another way that builders can help protect the environment. D) One way a building could be more green is through the use of green roofs and walls to reduce heating and cooling costs.

Thomas kratzer is the purchasing manager for the headquarters of a large insurance company chain with a central inventory operation. thomas's fastest-moving inventory item has a demand of 6,000 units per year. the cost of each unit is $100, and the inventory carrying cost is $10 per unit per year. the average ordering cost is $30 per order. it takes about 5 days for an order to arrive, and the demand for 1 week is 120 units. (this is a corporate operation, and the are 250 working days per year.)a) what is the eoq? b) what is the average inventory if the eoq is used? c) what is the optimal number of orders per year? d) what is the optimal number of days in between any two orders? e) what is the annual cost of ordering and holding inventory? f) what is the total annual inventory cost, including cost of the 6,000 units?