Custom Computers, Inc. assembles custom home computer systems. The heat sinks needed are bought for $12 each and are ordered in quantities of 1,280 units. Annual demand is 5,120 heat sinks, the annual inventory holding cost rate is $3 per unit, and the cost to place an order is estimated to be $55. (a) Calculate the following: (a) Average inventory level units (b) The number of orders placed per year orders (c) Thr total annual inventory holding cost \$ (d) The total annual ordering cost \$ (e) The total annual cost \$