Jules and Lin are married and filing jointly, with an adjusted gross income of $87,500. Determine the person's (or couple's) taxable income. Assume the standard deduction unless otherwise stated. Use Table 4E.1 to compute the tax owed. State the person's (or couple's) marginal tax rate (tax bracket); then calculate the effective tax rate as a percentage of taxable income. Calculate the effective tax rate as a percentage of adjusted gross income, and comment on why it differs from what you found in part (c)