For the following taxpayers, determine if they are required to file a tax return in 2022. Required: Ricko, single taxpayer, with gross income of $16,300. Fantasia, head of household, with gross income of $16,200. Ken and Barbie, married taxpayers with no dependents, with gross income of $21,300. Dorothy and Rudolf, married taxpayers, both age 68, with gross income of $23,200. Janyce, single taxpayer, age 73, with gross income of $12,200.