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

Required:

Ricko, single taxpayer, with gross income of $15,200.

Fantasia, head of household, with gross income of $15,100.

Ken and Barbie, married taxpayers with no dependents, with gross income of $20,200.

Dorothy and Rudolf, married taxpayers, both age 68, with gross income of $22,100.

Janyce, single taxpayer, age 73, with gross income of $11,100.