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Harry's Pepperoni Pizza Parlor produced 10,000 large pepperoni pizzas last year that sold for $10 each. This year Harry's produced 12,000 large pepperoni pizzas (identical to last year's pizzas) but sold them for $10 each. Based on this information, we can conclude that Harry's production of large pepperoni pizzas a. Increased real GDP by $20,000. b. Did not change nominal GDP. c. Decreased real GDP by $20,000. d. Did not change real GDP.