$3.$ Zencorp is considering buying a $$500,000$ production machine. It would be depreciated $($simplified straight line$)$ for $15$ years. This investment would allow the firm to increase sales by $$85,000$ per year. Operating expenses would increase by $$20,000$ per year also. The corporate tax rate is $21\%.$ What is the annual cash flow for the project?

a$)$ $$66,520$

b$)$ $$93,563$

c$)$ $$58,350$

d$)$ $$44,500$

e$)$ $$60,450$