Suppose the Big Enchilada restaurant has been offered a binding one-year lease agreement on an attractive site

Question:

Suppose the Big Enchilada restaurant has been offered a binding one-year lease agreement on an attractive site for $5,200 per month. Before the lease agreement has been signed, what is the incremental cost per month of site rental? After the lease agreement has been signed, what is the incremental cost per month of site rental? Explain.