can uou please show wrtingbout steps

Exercise - Disk Drive Housings HAL Ltd. Produces a line of high-capacity disk drives for mainframe computers. HAL uses the drive housings at a fairly steady rate of 720 per year. HAL can produce the disk drive housings at a rate of 150 housings per month. The housings cost HAL $85 each to produce, and the setup cost for beginning a production run is $700. Assume an annual interest rate of 28 percent for determining the holding cost. a. What is the optimal number of housings for HAL to produce in each production run? b. Find the time between initiation of production runs, the time devoted to production, and the downtime each production cycle. c. What is the maximum level of the on-hand inventory of the disk drive housings