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Maxwell's annual financial statements show operating profit before interest and tax of $514,041 thousand, net income of $314,842 thousand, provision for income taxes of $91,720 thousand and net nonoperating expense before tax of $108,396 thousand. Assume Maxwell's statutory tax rate for the year is 37%. Maxwell's effective tax rate is: Select one: a. 29.1% O b. 22.6% O c. None of these are correct. O d. 17.8% e. 37.0%