Problem 3-42 (Algorithmic) (LO. 5, 6,9) David and Ruby are engaged and plan to get married. During 2021, David is a full-time student and earns $7,600 from a part-time job. With this income, student loans, savings, and nontaxable scholarships, he is self-supporting. For the year, Ruby is employed and has wages of $85,800 Click here to access the standard deduction table to use. Click here to access the Tax Rate Schedules. If an amount is zero, enter, "O". Do not round your intermediate computations. Round your final answer to nearest whole dollar. a. Compute the following: David Filing Single Ruby Filing Single Gross income and AGI 7,600 85,800 Standard deduction (single) 12,400 12,400 Taxable income Income tax b. Assume that David and Ruby get married in 2021 and file a joint return. What is their taxable income and income tax? Round your final answer to nearest whole dollar. Married Filing Jointly Gross Income and AGI Standard deduction (married, hiling jointly) a. Compute the following: David Filing Single Ruby Filing Single Gross Income and AGI 7,600 85,800 Standard deduction (single) 12,400 12,400 Taxable income Income tax b. Assume that David and Ruby get married in 2021 and file a joint return. What is their taxable income and income tax? Round your final answer to nearest whole dollar. Married Filing Jointly Gross income and AGI Standard deduction (married, filing jointly) Taxable income Income tax c. How much income tax can David and Ruby save if they get married in 2021 and file a joint return