Answer:
Celebruity has a unit contribution margin of $35 ($100-$62-$3), currently.
Celebrity will have a unit contribution margin of $42.25 =($110-$62-$2.75) whit the changes.
This is an increase of $10.25 in the unit contribution margin.
Sales volume remains to be the same at 150 units ($15000 / $100), so the effect on contribution margin is $1537.50 = (150 X $10.25).
The contribution margin increase equals the net income increase, $1537.5 because the costs remain the same