Suppose that Glitter Gulch, a gold mining firm, increased its sales revenues on newly mined gold from $100 million to $300 million between one year and the next. Assuming that the price of gold increased by 100 percent over the same period, by what numerical amount did Glitter Gulch's real output change? If the price of gold had not changed, what would have been the change in Glitter Gulch's real output?