Please i need manual solution pleasssse

For the data in Table $2\mathrm{.}9,$ evaluate the cost of the plan given in the table if an in$-$house regular hour is $10$$$,$ overtime hour is $15$$$,$ and a contract man$-$hour costs $25.$ In addition, every backlog man$-$hour delayed from period t to t $+1$ costs $5.$ Develop an alternative competitive plan in which you can have instead of $5$ skilled employees have a mixture of skill and unskilled. The hour of unskilled worker is $8$$$.$

such as electrical or instrument. As an example, the mechanical workload is first

$38$

$2$ Maintenance Strategic and Capacity Planning

classified into two grades. The skill the work requires and its impact on the facility determines the grade. In this example, it is classified as grade one and grade two mechanical workload, although other classifications based on skill and priority are possible. Prior to presenting the plan in Table $2\mathrm{.}9,$ the following notation is defined as follows:

$F{M}_t,$ Total forecasted mechanical load

$B_{t-1},$ Mechanical workload backlog from period $t-1$

$T{M}_t,$ Total mechanical workload, for period $t.T{M}_t=F{M}_t+B_{t-1}$

$T{M}_{i,t}$ Total mechanical workload of grade $i$ in period $t,i=1,2$

$R{M}_{i,t}$ Regular in$-$house capacity for mechanical workload of grade $i$ in period $t$

$O{M}_{i,t}$ Overtime capacity for mechanical workload of grade $i$ in period $t$

$C{M}_{i,t}$ Contract capacity for mechanical workload of grade $i$ in period $t$