Problem 8 For each of the following situations (none of the taxpayers claim dependents), indicate whether the taxpayer(s) is (are) required to file a tax return for 2021 Explain your answer. 1. Helen is a single taxpayer with interest income in 2021 of $8,750. 2. Joan is a single college student who is claimed as a dependent by her parents. She earned $1,550 from a part-time job and has $1,150 in interest income. 3. Leslie, age 64, and Mark, age 66, are married and file a joint return. They received $17,800 in interest income from a savings account. 4. Ray, age 60, and Jean, age 57, are married and file a joint tax return. Their only income is $14,700 in interest income. 5. Harry, a 19-year-old single taxpayer, had net earnings from self-employment of $1,500.