For the following taxpayers, determine if they are required to file a tax return in 2022 . Required: a. Ricko, single taxpayer, with gross income of $17,200. b. Fantasia, head of household, with gross income of $17,100. c. Ken and Barbie, married taxpayers with no dependents, with gross income of $22,200. d. Dorothy and Rudolf, married taxpayers, both age 68 , with gross income of $24,100. e. Janyce, single taxpayer, age 73 , with gross income of $13,100..