Calculating marginal tax rates. Amelia Hall is single and received the items and amounts of income shown as follows during 2018. Determine the marginal tax rate applicable to each item. Note that if the item is not taxable, the marginal rate is 0. SalaryDividendsGiftfrommotherChildsupportfromex-husbandInterestonsavingsaccountRentalpropertyLoanfrombankInterestonstategovernmentbonds$30,0008005003,6002509002,000300