Clarissa seager is the purchasing agent for central valve company, which sells indus¬trial valves and fluid-control devices. one of its most popular valves is the western, which has an annual demand of 4,000 units. the cost of each valve is $90.00, and the inventory carrying cost is estimated to be 10% of the cost of each valve. clarissa has made a study of the costs involved in placing an order for any of the valves that cen¬tral valve stocks, and she has concluded that the average ordering cost is $25.00 per order. furthermore, it takes about 8 work days for an order to arrive from the supplier. dur¬ing this time, the demand per week (= 5 work days) for central's valves is approximately 80. assume there are 250 work days per year.
what is the economic order quantity? round up to the nearest unit

Arival company manufactures fuel tanks for cars using a different production technique. the total weekly cost (in dollars) of producing x tanks is given by c(x) = 10000 +90x - 0.04x2 find the marginal cost at a production level of 500 fuel tanks per week to approximate the cost of the 501st unit (round to the nearest 2 decimal places, if needed)

Which of the following tends to result in a decrease in the selling price of houses in an area? a. an increase in the population of the city or town. b. an increase in the labor costs of construction. c. an increase in the income of new residents in the city or town. d. an increase in mortgage interest rates.

1. alwaysrain irrigation, inc. would like to determine capacity requirements for the next four years. currently, two production lines are in place for making bronze and plastic sprinklers. three types of sprinklers are available in both bronze and plastic: 90-degree nozzle sprinklers, 180-degree nozzle sprinklers, and 360-degree nozzle sprinklers. management has forecast demand for the next four years as follows: both production lines can produce all the different types of nozzles. the bronze machines needed for the bronze sprinklers require two operators and can produce up to 12,000 sprinklers. the plastic injection molding machine needed for the plastic sprinklers requires four operators and can produce up to 200,000 sprinklers. three bronze machines and only one injection molding machine are available. what are the capacity requirements for the next four years? (assume that there is no learning.)