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Jack has calculated his income tax (Line 16) for 2020 at $1,800. Jack is entitled to a $2.400 non- refundable credit, a $1,500 business credit, and a $600 refundable credit. In addition, Jack had $2,300 of federal income taxes withheld from his salary. What is Jack's refund for the year? O $4,400 O $1,100 $2.900 O $5,000 $2,600 Oliver earned $175.283 of business profit from his sole proprietorship in 2020. This is his only source of earned income for the year. What is his self-employment tax for the year O $21,068 O $26,818 O $24,767 $19,456 O $21,769