A married couple received $$8,600$ of social security benefits.

a$.$ Calculate the taxable amount of those benefits if the couple's provisional income is $$19,000.$

b$.$ Calculate the taxable amount of those benefits if the couple's provisional income is $$36,500.$

c$.$ Calculate the taxable amount of those benefits if the couple's provisional income is $$53,000.$

$\backslash$table$[[,\backslash$table$[[$Taxable amount$],[$of benefits$]]],[$a$.,],[$b$.,],[$c$.,]]$