Sally works in a designer pillow store that has monthly costs of $5500 for rent, $4,000 for salaries and $9700 for other fixed expenses. Designer pillows sell for $40.00 each. It costs $19.50 to make each pillow. What is Sally's monthly net income if 500 pillows are sold at the selling price of $39.99?

Use six decimal places for any intermediate calculations and round the final answer to 2 decimal places. (e.g., $0.00)

Include the negative sign (-) if the answer is a loss (e.g., -$1.00)