Use the following table for a hypothetical single-product economy.

year units of output price of bagel per unit price index(year 1=100)

1 10 $10 100

2 12 20 200

3 15 30 300

4 20 40 400

a)Referring to the above data, calculate

i)The Nominal GDP in year 3

ii)The Real GDP in year 3

iii)The Nominal GDP in year 4.

iv)The Real GDP in year 4.(4 marks)

b)i)Suppose a nation's 2003 nominal GDP was $972 billion and the general price index was 90. To make the 2003 GDP comparable with the base year GDP, the 2003 GDP must be: (3 marks)

c)Describe the factors might cause a change in aggregate demand.(3 marks)