Latesha, a single taxpayer, had the following income and deductions for the tax year $2024$: INCOME:Salary$$100,000$Business income $25,000$Interest income from bonds $10,000$Tax$-$exempt bond interest $5,000$TOTAL INCOME$$140,000$ DEDUCTIONS:Business expenses$ $9,500$Itemized deductions $20,000$TOTAL DEDUCTIONS$ $29,500$ a$.$Compute Lateshas taxable income and federal tax liability for $2024($round to dollars and ignore the qualified business income deduction for this problem$).$b$.$Compute Lateshas marginal, average and effective tax rates.c$.$For tax planning purposes, which of the two rates in $($b$)$ is the most important?