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 $15,000. b. Fantasia, head of household, with gross income of $17,500. c. Ken and Barbie, married taxpayers with no dependents, with gross income of $20,000. d. Dorothy and Rudolf, married taxpayers, both age 68 , with gross income of $25,500. e. Janyce, single taxpayer, age 73, with gross income of $13,500. Complete this question by entering your answers in the tabs below. Ricko, single taxpayer, with gross income of $15,000