Mrs. Singer owns a profitable sole proprietorship. For each of the following cases, use a Schedule SE, Form 1040, to compute her 2017 self-employment tax and her income tax deduction for such tax.

A. Compute 2017 self-employment tax and the income tax deduction for such tax if Mrs. Singers net profit from Schedule C was $51,458. She had no other earned income.

B. Compute 2017 self-employment tax and the income tax deduction for such tax if Mrs. Singers net profit from Schedule C was $51,458, and she received a $80,000 salary from an employer.

C. Compute 2017 self-employment tax and the income tax deduction for such tax if Mrs. Singers net profit from Schedule C was $51,458, and she received a $137,000 salary from an employer.