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D Question 5 5 pts Tank Industries produces and sells a single product. The selling price is $30 per unit, variable costs are $21 per unit, and total fixed costs are $135,000. How many units does Tank need to produce and sell to generate operating income equal to 12% of its total sales revenue? Round to the nearest whole number and do not enter a decimal point (e.g., enter 89, not 89.2)