Economy B produces 1550 units of output. It sells 1200 of these to domestic consumers at a price of 5 per unit, and exports the remaining 350 units to countries overseas at a price of 6 per unit. The country also imports 150 units of another good at a price of 4 per unit. There is neither investment nor government expenditure in this economy. The gross domestic product, as measured by expenditure, is: O a. 8700 O b. 8500 O c. 1550 O d. 6000 O e. 7500