Answer:
40.91% percentage of Robert income spend on his mortgage .
Explanation:
Formula

As given
Robert has a monthly income of $1650.00.
His monthly mortgage payment is $675.00.
Total value = $ 1650
Part value = $ 675
Put all values in the formula


Percentage = 40.91% (Approx)
Therefore the 40.91% percentage of Robert income spend on his mortgage .