A real estate agency has fixed monthly costs associated with rent, staff salaries, utilities, and supplies. It earns its money by taking a percentage commission on total real estate sales. During the month of July, the agency had total sales of $832,000 and showed a net income (after paying fixed costs) of $15,704. In August, total sales were $326,000 with a net income of only $523 (a) Use a formula to express net income as a linear function of total sales. Let / be the net income in dollars, and let's be the total sales in dollars. (Round the terms to two decimal places.) N ( s ) = X (b) Plot the graph of net income 20000 20000 Z N 10000 10000 O 200000 400000 600000 800000 200000 400000 600000 800000 -10000 -10000 O O 20000 20000 N N 10000 10000 of 200000 400000 600000 800000 200000 400000 600000 800000 -10000 -10000 Identify the slope and vertical intercept. (Round your answers to two decimal places.) slope 0.03 vertical intercept (s, N) = 0 X (c) What are the real estate agency's fixed monthly costs? (Round your answer to two decimal places.)