There is linear relationship between number of units, N(x), of the product which the company sells and amount of money, x, spent on advertising. If company spends 25,000 on advertising, it sells 400 units, and for each additional 5,000 spent, it sells 20 units more.
A. Compute and interpret N(20,000)
B. Compute a formula for N(x) in terms of x.
C. Write interpretations of slope and x- and y- intercepts of N(x) if possible.
D. Compute and interpret N^-1(500).