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