Preston and Anna are engaged and plan to get married. During 2021, Preston is a full-time student and earns $5,800 from a part-time job. With this income, student loans, savings, and nontaxable scholarships, he is self-supporting. For the year, Anna is employed and has wages of $57,200. 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: Gross income and AGI Standard deduction (single) Taxable income Income tax Preston Anna Filing Single Filing Single 5,800 $ 57,200 12,550 $ $ b. Assume that Preston and Anna get married in 2021 and file a joint return. What is their taxable income and income tax?