Samuel recently moves to Floridaand lives in a home he was gifted by his grand parents.If he were to rent that place, he could have earned $20,000 per year in rent. Further, the house he owned in Maine was rented to another family for $21,000 per year. How much do the housing services provided by the two houses contribute to GDP?

a.$20,000

b.$41,000

c.$21,000

d.$0