Already posted once and it was solved all wrong. pls insert correct formula for the question

gt. Barnes is a veteran police officer filing as Head of Household. Currently, her taxable income is $50,000, but has een asked to sit for the Leutenant's exam. She is excited about the opportunity as the pay raise will give her an dditional $15,000 of taxable income. Sgt. Barnes would like to know what the tax implication will be with the romotion and raise. Sgt. Barnes also moonlights as a private security guard for major sporting events and is oncerned the promotion and raise will have an adverse impact on her marginal tax rate. 616