Fred and Wilma, married taxpayers, earn $105,000 in taxable income and $20,000 in interest from an investment in City of Bedrock Bonds. Using the U.S. tax rate schedule for married filing jointly for year 2015, how much federal tax will they owe? What is their average tax rate? What is their effective tax rate? What is their current marginal tax rate? If Fred and Wilma earn an additional $40,000 of taxable income, what is their marginal tax rate on this income? (Round the tax rates to 2 decimal places, e.g., .12345 as 12.35%)

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