t$.$ Jacobs Enterprise rents a small workshop for $50$ per week, but at present does

not use it$.$ The firm could sub$-$let the workshop for $80$ per week, but they are considering using it themselves for a new project.

In assessing whether the new project is worthwhile, what is the appropriate cost for Jacobs

Enterprise to use for the workshop?

a$.50$ per week b$.30$ per week

c$.80$ per week d$.130$ per week