Determine the retirement savings contributions credit in each of the following independent cases. Use Table $9-2.$

$\backslash$table$[[,\backslash$table$[[$Retirement$],[$Savings$],[$Contributions$],[$Credit:$]]],[$a$.$ A married couple fling jointly with modifed ASI of S$37.$ Gog and an IRA contribution of S$1\mathrm{.}600.,],[$b$.$ A married couple filing jointly with modined AGl of $558\mathrm{.}009$ and an $|$RA contribution of $31,500.,],[$C$.$ A head of household taxpayer with modifed AGI of SP$2,$ p$00$ and Roth IRA contribution of S$2,000.,],[$d$.$ A single taxpayer with modified AGI of $$12,000$ and an IRA contribution oi $32,300.,]]$