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STU Corp. had $38,000,000 in revenues (sales), $12,600,000 in Costs of Goods Sold (COGS), $5,300,000 in SG\&A expenses, $4,700,000 in depreciation expenses, $3,400,000 in interest expenses, and $2,200,000 in tax expenses. The firm held $36,900,000 in total assets, of which $2,100,000 were in cash or equivalent, $4,600,000 were in accounts receivable, and $5,700,000 were in inventories. $23,600,000 of the $35,900,000 in total assets were in shareholder's equity, What was the firm's average tax rate? 15.67% 18.33% 19.92% 21.54%=