You are the audit manager for Ken-Ron Enterprises. Your firm has been the entity's auditor for 15 years. Your firm normally uses a range of 3% to 5% of income before taxes to calculate overall materiality and 50-75% of overall materiality to calculate tolerable misstatement. Ken-Ron has reported the following financial statement data (in millions) for the last four years: Income before taxes 2018 105* Total assets Total revenues 23,422 20,272 2017 584 16,137 13,289 2016 2015 520 13,239 9,189 453 11,966 8,984 *Note that the significant decline in income before taxes in 2018 is due to a large nonrecurring charge. Required: a. If you planned on using income before taxes as the benchmark to compute overall materiality and tolerable misstatement, how would you compute those amounts for 2018? Prepare and justify your calculations. b. Determine overall materiality and tolerable misstatement using either total assets or total revenues as the benchmark. Make the calculations by utilizing both .25% and 2%, the endpoints of the range that your firm's guidance provides. c. Assume that during the course of the 2018 audit you discovered misstatements totaling $50 million (approximately 50% of the 2018 income before taxes of $105 million). Discuss whether this amount of misstatement is material given your benchmark calculations from parts a. and b. above