SKC Engineering Sdn Bhd manufacturer of roofing supplies has developed monthly forecasts for an important producer and presented the $6-$month period January to June in table below.

Month Expected demand $($Units$)$ Production days $($Units$)$ Demand per day $($days$)$

Jan $9002241$

Feb $7001839$

March $8002138$

April $1,2002157$

May $1,5002268$

June $1,1002055$

Total $6,200124$

Average requirement $=6,200/124=50$ units per day

Other Cost Information:

Info Total $($RM$)$

Inventory carrying cost RM$5$ per unit per month

Subcontracting cost per unit RM$10$ per unit

Average pay rate RM$5$ per hour $($RM$40$ per day$)$

Overtime pay rate RM$7$ per hour $($above $8$ hrs per day$)$

Labor$-$hours to produce a unit $1\mathrm{.}6$ hours per unit

Cost of increasing production rate $($hiring$)$ RM$10$ per unit

Cost of decreasing production rate $($layoffs$)$ RM$15$ per unit

a$)$ Analysis of Plan $1$ : constant workforce of $10$ workers

b$)$ Analysis of Plan $2$ : Hiring and layoffs to meeting demand

c$)$ Recommend your answer to top management of SKC Engineering Sdn Bhd$.$