Given the tax rates as shown, what is the average tax rate for a firm with taxable income of OMR 330,000? Taxable income $0 - 50,000 50,001 - 75,000 75,001 - 100,000 100,001 - 335,000 Tax Rate 15% 25% 34% 39% Select one: a. 31.02 percent b. 31.17 percent c. 33.92 percent d. 34.07 percent e. 39.00 percent