Response:

Detailed explanation:
Income of an individual in 2001 = 
Income of an individual in 2003 = 
In this case, we aim to determine the ratio of income from 2001 to that from 2003 in its simplest form.
That is, we need to express
in simplest terms.
A fraction is considered to be in simplest form if 

Thus, we first find
then divide both the numerator and denominator by the HCF.
Here,


On dividing both numerator and denominator by 6, we get