I really need help with part B!

Problem 1-41 (LO 1-3) 1.5 points Scot and Vidia, married taxpayers, earn $160,500 in taxable income and $5,000 in interest from an investment in City of Tampa bonds. (Use the U.S. tax rate schedule for married filing jointly). Required: a. If Scot and Vidia earn an additional $104,750 of taxable income, what is their marginal tax rate on this income? b. What is their marginal rate if, instead, they report an additional $104,750 in deductions? (For all requirements, do not round intermediate calculations. Round your answers to 2 decimal places.) Answer is complete but not entirely correct. a. b. Marginal tax rate Marginal tax rate 23.85 20.18 % % Schedule Y-1-Married Filing Jointly or Qualifying Widow(er) If taxable income is over: But not over: The tax is: $ 0 $ 19,400 10% of taxable income $ 19,400 $ 78,950 $1,940 plus 12% of the excess over $19,400 $ 78,950 $168,400 $9,086 plus 22% of the excess over $78,950 $168,400 $321,450 $28,765 plus 24% of the excess over $168,400 $321,450 $408,200 $65,497 plus 32% of the excess over $321,450 $408,200 $612,350 $93,257 plus 35% of the excess over $408,200 $612,350 $164,709.50 plus 37% of the excess over $612,350 solod Tood wobold