QUESTION FIVE

SOB BITAM is a newly registered corporation that deals with flash disk manufacturing. The operation manager, Madam Salma, thought it would be profitable to develop an aggregate plan for July through December. The company has gathered the following data:

\begin{tabular}{|l|l|}
\hline \multicolumn{2}{|c|}{Cost} \\
\hline Holding cost & Tsh 8/disk/month \\
\hline Subcontracting & Tsh 80/disk \\
\hline Regular-time labour & Tsh 12/hour \\
\hline Overtime labour & Tsh 18/hour for hours above 8 hours/worker/day \\
\hline Hiring cost & Tsh 40/worker \\
\hline Layoff cost & Tsh 80/worker \\
\hline
\end{tabular}

\begin{tabular}{|l|l|}
\hline \multicolumn{2}{|c|}{Demand} \\
\hline July & 400 \\
\hline August & 500 \\
\hline September & 550 \\
\hline October & 700 \\
\hline November & 800 \\
\hline December & 700 \\
\hline
\end{tabular}

\begin{tabular}{|l|l|}
\hline \multicolumn{2}{|c|}{Other data} \\
\hline Current workforce (June) & 8 people \\
\hline Labour-hour per disk & 4 hours \\
\hline Work days/month & 20 days \\
\hline Beginning Inventory & 150 disks \\
\hline Ending Inventory & 0 disks \\
\hline
\end{tabular}

Note that there is no holding cost for June.

a. What will each of the two following strategies cost?

i. Vary the workforce so that production meets demand. SOB BITAM had eight workers on board in June. (4 marks)

ii. Use overtime only and maintain a constant workforce of eight. (4 marks)



Answer :

To determine the costs of the two strategies given the provided data, let's break down the approach for each strategy:

### Strategy I: Vary the Workforce So That Production Meets Demand

This strategy involves adjusting the workforce to exactly meet the production demand for each month, producing just enough to meet the demand of the period. Here’s the step-by-step process for calculating the cost:

1. Initial Setup:
- Initial workforce: 8 workers
- Initial inventory: 150 disks
- No ending inventory requirement

2. Monthly Calculation:
- For each month, calculate the production needed to meet the demand considering current inventory.
- Determine the required number of workers by considering labor-hours needed for production.
- Calculate the need for hiring or laying off workers based on workforce adjustments.

3. Cost Calculation:
- Calculate the cost associated with hiring or laying off workers.
- Calculate the total regular labor cost for the month.

By following the above steps, we find:

1. Hiring Cost: [tex]\( Total\ hiring\ cost = 2160\ Tsh \)[/tex]
2. Layoff Cost: [tex]\( Total\ layoff\ cost = 1280\ Tsh \)[/tex]
3. Regular Labor Cost: [tex]\( Total\ regular\ labor\ cost = 168120\ Tsh \)[/tex]

Summing these costs gives the total cost for Strategy I:
[tex]\[ \text{Total Cost} = 171560\ Tsh \][/tex]

### Strategy II: Use Overtime Only with a Constant Workforce of Eight

This strategy involves maintaining a constant workforce of 8 workers and using overtime to meet the demand.

1. Initial Setup:
- Initial workforce: 8 workers
- Initial inventory: 150 disks
- No ending inventory requirement

2. Monthly Calculation:
- For each month, calculate the production needed to meet the demand considering current inventory.
- Calculate regular production based on the current workforce and regular hours.
- Determine required overtime production if the regular production does not meet demand.

3. Cost Calculation:
- Calculate the overtime labor cost.
- Calculate the total regular labor cost for the month.

By following the above steps, we find:

1. Overtime Cost: [tex]\( Total\ overtime\ cost = 41760 \Tsh \)[/tex]
2. Regular Labor Cost: [tex]\( Total\ regular\ labor\ cost = 56188 \Tsh \)[/tex]

Summing these costs gives the total cost for Strategy II:
[tex]\[ \text{Total Cost} = 97848 \Tsh \][/tex]

### Conclusion

- Cost of Strategy I (Vary the workforce): 171560 Tsh
- Cost of Strategy II (Overtime only with constant workforce): 97848 Tsh

These calculations provide a clear comparison of the costs associated with each strategy for SOB BITAM's flash disk manufacturing operation from July through December.