The president does not want to change the selling price. Instead, he wants to increase the sales commission by $1.70 per unit. He thinks that this move, combined with some increase in advertising, would increase this year's sales by 25%. How much could the president increase this year's advertising expense and still earn the same $1,380,000 net operating income as last year?

Feather Friends, Inc., distributes a high-quality wooden birdhouse that sells for $120 per unit. Variable expenses are $60.00 per unit, and fixed expenses total $180,000 per year. Its operating results for last year were as follows:

Sales$3,120,000Variable expenses1,560,000Contribution margin1,560,000Fixed expenses180,000Net operating income$1,380,000