Please answer it correctly

David and Ruby are engaged and plan to get married. During 2021, David is a full-time student and earns $8,500 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 $72,600. 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: David Filing Single Ruby Filing Single Gross income and AGI 8,500 57,200 Standard deduction (single) 12,550 12,550 Taxable income 0 44,650 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 81,100 Standard deduction (married, filing jointly) 25,100 Taxable income 40,100 Income tax 4,613 C. How much income tax can David and Ruby save if they get married in 2021 and file a joint return? 1,443