What are the after-tax rates of return per period for holding periods of 3, 5, 10, and 20 years for an investment in tax-exempt bonds, taxable bonds, SPDAs cashed out after age 59.5 (no excise tax), and SPDAs cashed out before age 59.5, requiring a 10% nondeductible excise tax (in addition to the normal tax) on the accumulated interest, for an investor facing a 40% ordinary tax rate each period and a 30% ordinary tax rate each period

Portia grant is an employee who is paid monthly. for the month of january of the current year, she earned a total of $8,388. the fica tax for social security is 6.2% of the first $118,500 earned each calendar year and the fica tax rate for medicare is 1.45% of all earnings. the futa tax rate of 0.6% and the suta tax rate of 5.4% are applied to the first $7,000 of an employee's pay. the amount of federal income tax withheld from her earnings was $1,391.77. what is the total amount of taxes withheld from the portia's earnings?