Hi Rinoa,
1)Exports of food are 4,000x1/10=$400 mil.
Domestic consumption = 3,600+2,400=$6,000mil.
Imports of food= 200x12=$2,400mil.
The exports for GDP are $400mil, and the imports are $2,400mil.
2) Imports of desks=90,000x50=$4,500,000
Consumptions by gov.,firm, household=...