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Henry Hawkins Industries income statement for the most recent year is given below. Percentag Total Per Unit e Sales (40,000 units) $800,000 $20 100% Variable expenses --- 560.000 14 70% Contribution margin 240,000 $6 30% --- Fixed expenses 192.000 Net income $48,000 Refer to the original data. The president does not want to change the sales price. She wants to increase sales commissions (a variable expense) by $1 PER UNIT. She thinks this move, combined with some increase in advertising (a fixed expense), would cause annual sales volume (IN UNITS) to double. By how much could advertising be increased with net income remaining unchanged at $48,000