In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Q: Per capita income or average income is the average amount of money a person gets in a year .
A: 
Per capita income ( PCI ) or average income measures the average income earned per person in a given area ( city , region , country , etc . ) in a specified year .