Answer:
a. Income before advertising budget increase:
= Contribution margin - Fixed costs
= (38 * 3,600) - 79,000
= $57,800
Income after advertising budget increases:
= Sales - Variable expenses - Fixed expenses
Sales = (3,600 + 100 units) * 95 per unit
= $351,500
Variable expenses = 60% * 351,500
= $210,900
Fixed expenses = 79,000 + 8,400 advertising
= $87,400
Income = 351,500 - 210,900 - 87,400
= $53,200
b. Income decreased with the increase in advertising so Advertising budget should not be increased.