Obj. $5$ Green Manufacturing is a traditional manufacturing company located in the midwestern United States. The company's operations manager is developing a strategy to become more CSR$-$oriented. In an effort to evaluate possible areas where CSR initiatives can be implemented, the manager has gathered the following data regarding three potential CSR activities:

$\backslash$table$[[,$Initial Added Cost,Variable Cost,Variable Savings$],[$Recycle and reuse production materials,$$5,000,$$$0\mathrm{.}10$ per $Ib.$ of recycled material,$$0\mathrm{.}15$ per $lb.$ of recycled material$],[$Add solar panels as a source of power,$700,000,$$$1,000$ per year,$$33,000$ per year$],[$Replace assembly room light fixtures with natural light,$120,000,$$$180$ per month,$$220$ per month$]]$

The recycling activity would carry on indefinitely. The solar panels would have a useful life of $30$ years. The replacement of assembly room light fixtures with natural light is assumed to have an $80-$year effect.

a$.$ Identify which CSR activities Green Manufacturing should implement.

b$.$ For each CSR activity you recommend, identify an appropriate related performance metric.