8) For the following taxpayers indicate whether the taxpayer should file a tax return and why. a. Robert earned $50,000 this year as a staff accountant. His estimated tax liability is $4,500, and he expects to receive a $500 tax refund. b. Amy earned $4,000 this year working part-time. She will have no federal tax liability and has not made any federal tax payments. c. Ty earned $2,500 this summer and had $200 of federal taxes withheld from his paycheck. He will have no federal tax liability this year. d. Startup Corporation had a $50,000 loss this year. e. The Walker Family Trust earned $500 of gross income this year.