The S&OP team $($see Problem $13\mathrm{.}9)$ is considering two more mixed strategies. Using the data in Problem $13\mathrm{.}9,$ compare Plans C and D with Plans A and B and make recommendations.

$$ Plan C: Increase the workforce to bring production from cur$-$ rent levels of $1000$ units up to a steady $1,200$ units per month. Use overtime up to a maximum of $300$ units per month. All remaining demand is to be met using a subcontractor. The cost of overtime is at a premium of $$40$ per unit.$$ Plan D: Keep the current workforce at a level capable of producing $1,200$ units for the months of July up to and in$-$ cluding September. At the beginning of October hire addi$-$ tional workers to bring capacity up to $1800$ units per month. Where necessary use inventory to absorb any additional stock.