Calculate the value of final goods (which will become part of the GDP) in the case given below.
cotton farmer sells his weekly output of cotton to a weaver for ? 5,000. The weaver weaves cloth out of this and sells it to the cloth trader for ? 6,500. The trader sells part of this cloth to a shirt maker for ? 5,000 and the remaining cloth to a retailer for ? 3,000. The shirt maker makes 60 shirts, each selling for ? 150. The cloth retailer sells his cloth to the final customers for ? 4,000.