Feather Friends, Incorporated, distributes a high$-$quality wooden birdhouse that sells for $$80$ per unit. Variable expenses are $$40\mathrm{.}00$ per unit, and fixed expenses total $$180,000$ per year. Its operating results for last year were as follows:

Sales $ $2,160,000$

Variable expenses $1,080,000$

Contribution margin $1,080,000$

Fixed expenses $180,000$

Net operating income $ $900,000$

Required:

Answer each question independently based on the original data:$5.$ The sales manager is convinced that a $15\%$ reduction in the selling price, combined with a $$65,000$ increase in advertising, would increase this year's unit sales by $25\%.$

a$.$ If the sales manager is right, what would be this year's net operating income if his ideas are implemented?

b$.$ If the sales manager's ideas are implemented, how much will net operating income increase or decrease over last year?

$6.$ The president does not want to change the selling price. Instead, he wants to increase the sales commission by $$2\mathrm{.}20$ per unit. He thinks that this move, combined with some increase in advertising, would increase this year's unit sales by $25\%.$ How much could the president increase this year's advertising expense and still earn the same $$900,000$ net operating income as last year?