Expenditures for consumer goods and services $4,565
Exports $740
Government purchases of goods and services $1,465
Social Security taxes $510
Net investment $225
Indirect business taxes $520
Imports $825
Gross investment $865
Corporate income taxes $185
Personal income taxes $750
Corporate retained earnings $45
Net foreign factor income $20
Government transfer payments to households $690
Net interest payments to households $0
On the basis of Table, depreciation is
a. $640 billion.
b. $50 billion.
c. $85 billion.
d. $690 billion.

With reference to the solutions, following things may be noted1) homogeneous solutions comprises of single phase.2) heterogeneous solution comprises of more than one phase.3) in colloidal solution, solute is evenly distributed in solvent. in such system, it is difficult to separate solute and solvent.4) in suspension, there is an uneven distribution of solute in solvent. in such system, solute and solvent gets separated on standing long.    blood is a homogeneous and colloidal solution,salad dressing is a heterogeneous and suspension solution.