do explain to me how to solve this question. I got a wrong answer for this.

b) The following table shows the national income data. Items RM million Agriculture 270 Manufacturing 490 Banking 560 Communication 610 Gas and electricity 123 Government services 270 Wholesales and retails 90 Constructions 325 Wages and salaries 430 Indirect tax 250 Subsidies 120 Net factors income from abroad (345) Capital consumption 200 Personal income taxes 452 Transfer payment 178 ) Calculate the Gross Domestic Product (GDP) at market price. (3 marks) i) Calculate the Gross National Product (GNP) at factor cost. (3 marks) ii) Compute the national income. (2 marks) iv) State two (2) problems in measuring the national income. (2 marks)