Marty has a total annual income of $$37,630\mathrm{.}00.$ He is married filing jointly, he claims two children under the age of $17,$ and he takes the standard deduction.

a$.$ If Marty has made charitable contributions of $$175\mathrm{.}00$ during the year, calculate Marty's taxable income $(1040$ line $15).$

b$.$ Determine the amount owed in Federal Income Taxes for the year before any credits are applied $(1040$ line $16).$