In January, Ms. NW projects that her employer will withhold $25,000 from her 2019 salary. However, she has income from several other sources and must make quarterly estimated tax payments.

A. Compute the quarterly payments that result in a 2019 safe-harbor estimate assuming that her 2018 AGI was $176,000, and her tax was $47,200.

(The answer for A. is NOT 51,920 or 26,920)

B. Compute the quarterly payments that result in a 2019 safe-harbor estimate assuming that her 2018 AGI was $139,000, and her tax was $36,800.

(The answer for B is NOT 36,800 or 11,800)

I have already tried two different ways to solve this for both A & B and neither were right. HELP!