Consider the following production chain for a jersey. Assume that a Farmer shears sheep for wool, and sells this to a Miller for $7.00. The Miller spins thread, and sells this to a Manufacturer for $12.00. The Manufacturer makes a jersey, and sells this to a Retailer for $30.00 per jersey. The Retailer sells a jersey to a customer for $45.00. What is the contribution to GDP associated with this chain of activity?