a$.$ Ellie is $15$ and claimed as a dependent by her parents. She has $$1,125$ in dividends income and $$2,960$ in wages from a part$-$time job.

b$.$ Ruby and Woody are married and file a joint tax return. Ruby is age $66,$ and Woody is $69.$ Their taxable retirement income is $$15,030.$

c$.$ Shonda is age $68$ and single. She is claimed by her daughter as a dependent. Her earned income is $$540,$ and her interest income is $$425.$