Required information [The following information opplies to the questions disployed below] Grody received $9.000 of Sociol Security benefits this year Grody also reported solary and interest income this year What amount of the benefits must Grady include in his gross income under the following five independent situations? Note: Leave no answer blank. Enter zero if applicable. a. Grody files single and reports salary of $14,100 and interest income of $450