please show me the work I need to understand that thanks.

Problem 1-35 (LO 1-3) (Algo) Chuck, a single taxpayer, earns $79,200 in taxable income and $10,000 in interest from an investment in City of Heflin bonds. (Use the U.S. tax rate schedule.) Required: a. If Chuck earns an additional $40,500 of taxable income, what is his marginal tax rate on this income? b. What is his marginal rate if, instead, he had $40,500 of additional deductions? (For all requirements, do not round intermediate calculations. Round percentage answers to 2 decimal places.) a. Marginal tax rate Marginal tax rate % % b. Individuals Schedule X-Single If taxable income is over: But not over: The tax is: $ 0 $ 9,875 10% of taxable income $ 9.875 $ 40,125 $987.50 plus 12% of the excess over $9.875 $ 40,125 $ 85,525 $4.617.50 plus 22% of the excess over $40.125 $ 85,525 $163,300 $14,605.50 plus 24% of the excess over $85,525 $163,300 $207,350 $33,271.50 plus 32% of the excess over $163,300 $207,350 $518,400 $47.367.50 plus 35% of the excess over $207,350 $518,400 $156,235 plus 37% of the excess over $518,400 Schedule Y-1-Married Filing Jointly or Qualifying Widow(er) If taxable income is over: But not over: The tax is: $ 0 $ 19,750 10% of taxable income $ 19,750 $ 80,250 $1,975 plus 12% of the excess over $19,750 $ 80,250 $171,050 $9,235 plus 22% of the excess over $80.250 $171,050 $326,600 $29.211 plus 24% of the excess over $171,050 $326,600 $414,700 566,543 plus 32% of the excess over $326.600 $414,700 $622,050 $94.735 plus 35% of the excess over $414,700 $622,050 $167,307.50 plus 37% of the excess over $622.050 Schedule Z-Head of Household If taxable income is over: But not over: The tax is: $ 0 $ 14,100 10% of taxable income $ 14,100 $ 53,700 $1.410 plus 12% of the excess over $14.100 $ 53,700 $ 85,500 $6.162 plus 22% of the excess over $53,700 $ 85,500 $163,300 $13.158 plus 24% of the excess over $85,500 $163,300 $207,350 $31.830 plus 32% of the excess over $163,300 $207,350 $518,400 $45.926 plus 35% of the excess over $207,350 $518,400 $154.793.50 plus 37% of the excess over $518.400 dul 1