Tim buys a house from Betty in 2011 for $200,000. Betty receives $185,000 and $15,000 goes to Mary, the real-estate agent. Betty originally purchased the house in 2007 for $240,000. What value is added to GDP in 2011 for this transaction? a) $15,000
b) $40,000
c) $200,000
d) $65,000