Nominal GDP
Total quantity X total price for given year
Real GDP
Quantity year (x) X price in base year
Real GDP year (x)
Nominal value in year (x) X 100 / general price index in year (x)
Inflation through GDP deflator
Nominal GDP/ Real GDP X 100
(the value above 100 is inflation e.g if the answer was 120 then inflation would be 20%)
Index Numbers
Price in year (x) / Price in base year X100
Index numbers to calculate annual changes
Index year in question - index of previous year / index of previous year X100