Using the model for the determination of GDP that we have employed on this course, you are given the following information about the aggregate spending variables for a specific year, and all expressed in £ million. Total Consumption 600 (C) Investment 200 (1) Government spending 200 (G) Exports 300 (X) Imports 300. (IM) Autonomous consumption 100 (a) a) What is the value of GDP?