Question

If disposable personal income​ (dpi) =​ $800 and personal income taxes​ = $100, then what is personal income​ (pi)?

Answer 1

The personal income is $700. 
GIven: 
Disposal personal income (dpi) = $800
Personal income taxes = $100

Solution:
Disposal personal income minus personal income taxes.
$800 - $100 = $700

So, the personal income or pi is equal to $700.