David and Ruby are engaged and plan to get married. During 2022 , David is a full-time student and earns 57,600 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 559,400 . Click here to access the standard deduction table to use. Click here to access the Tax Rate Schedules. If an amount is zero, enter, " 0 ". Do not round your intermediate computations. Round your final answer to nearest whole dollar. a. Compute the following: b. Assume that David and Ruby get married in 2022 and file a joint return. What is their taxable income and income tax? Round your final answer to nearest whole dollar. c. How much income tax can David and Ruby save if they get married in 2022 and file a joint return