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help me with these three questions answers?

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O Required information The following information applies to the questions displayed below) Monterey Co. makes and sells a single product. The current selling price is $15 per unit Variable expenses are $9 per unit, and fixed expenses total $27.000 per month (Unless otherwise stated, consider each requirement separately.) Management is considering a change in the sales force compensation plan. Currently each of the firm's two salespeople is paid a salary of $2,500 per month 9-1. Calculate the monthly operating income (or loss) that would result from changing the compensation plan to a salary of $400 per month, plus a commission of $0.80 per unit, assuming a sales volume of 5,400 units per month Answer is complete but not entirely correct Operating income $ 1.080 g-2. Calculate the monthly operating income (or loss) that would result from changing the compensation plan to a salary of $400 per month, plus a commission of $0.80 per unit, assuming a sales volume of 6,000 units per month Answer is complete but not entirely correct. Operating income $3,600 h-1. Assuming that the sales volume of 6,000 units per month achieved in part g could also be achieved by increasing advertising by $1000 per month instead of changing the sales force compensation plan. What would be the operating income or loss