For the following taxpayers, determine if they are required to file a tax return in 2022.

Required:

1. Ricko, single taxpayer, with gross income of $16,600.
2. Fantasia, head of household, with gross income of $16,500.
3. Ken and Barbie, married taxpayers with no dependents, with gross income of $21,600.
4. Dorothy and Rudolf, married taxpayers, both age 68, with gross income of $23,500.
5. Janyce, single taxpayer, age 73, with gross income of $12,500.