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In producing a sweater, a man who shears sheep pays a farmer €4 for a sheep's wool. The shearing shop sells the wool to a knitting mill for €7. The knitting mill buys the wool and makes it into a fine fabric and sells it to a sweater-making firm for €13. The sweater-making firm sells the sweater to a clothing store for €20, and the clothing store sells the sweater, gift wrapped, for €50. What is the contribution to GDP of the production and sale of the sweater?