3) The following information is available for Bob and Brenda Horton, a married couple filing a joint retum, for 2020. Both Bob and Brenda are age 32 and have no dependents. Salaries $200,000 Interest income 12,000 Deductible IRA contributions 25,600 11,000 Ttemized deductions Withholding 31,000 a. What is the amount of their gross income? b. What is the amount of their adjusted gross income? c What is the amount of their taxable income? d. What is the amount of their tax liability (gross tax), rounded to the nearest dollar? e. What is the amount of their tax due or refund due)