Use the following information to answer the question: There are three firms in an economy: X, Y, and Z. Firm X buys $400 worth of goods from Firm Y, and $200 worth of goods from Firm Z to produce 250 units of output at $3 per unit. Firm Y buys $250 worth of goods from Firm X and $250 worth of goods from Firm Z to produce 250 units of output at $4 per unit. Firm Z buys $100 worth of goods from Firm X and $500 worth of goods from Firm Y to produce 500 units at $2 per unit. Given this information, using the Value Added approach to eliminating intermediate goods and services (in order to avoid double-counting), what is the economy's GDP?