Mark, age 66, is single and has no dependents. His AGI is $56,000 and his itemized deductions are $12,850. He is not claimed as a dependent by anyone else. a. How much is Mark's standard deduction? b. How much is Mark's taxable income? Please do NOT enter any commas in your answers. If the answer is zero, please enter the word NONE. not the numeralo. QUESTION 20 Benjamin, age 18, is claimed as a dependent by his parents in 2021. He has dividend income of $1,000 and earns $1,700 from a part time job. a. How much is Benjamin's AGI? For Blank 1 b. How much is Benjamin's standard deduction? c. How much is Benjamin's taxable income