Velocity in the country of Shem is always stable. In 2002, the money supply was $200 billion and the GDP price deflator was four times as high as it was in the base year. In 2003, the money supply increased to $240 billion, the price level increased by 15 percent, and nominal GDP equaled $1,200 billion. Explain by how much did real GDP increase between 2002 and 2003?