$3)$ Billy is $16$ years old and is claimed as a dependent by his parents. During $2023,$ Billy has dividend income from of $$1,500,$ long$-$term capital gains from selling stock of $$300,$ and earnings from a summer job of $$950.$ What is Billy's taxable income?

$4)$ Mary, age $8,$ has interest income of $$6,200$ from corporate bonds given to her by her parents. He has no investment expenses. Her parents have taxable income of $$200,000$ and file a joint return. Assume that no parental election is made and Mary will file her own tax return. What is Mary's

total tax liability?