Simplify the following text for a Grade 11 native English-speaking person.
Original: GDP is an aggregate figure which does not account for differing sizes of nations . Therefore , GDP can be stated as GDP per capita ( per person ) in which total GDP is divided by the resident population on a given date , GDP per citizen where total GDP is divided by the numbers of citizens residing in the country on a given date , and less commonly GDP per unit of a resource input , such as GDP per GJ of energy or Gross domestic product per barrel .
Simplified: While nominal GDP is the total amount of money spent on GDP , real GDP ( like real in most economic meaning ) tries to correct this number for inflation .