Current Attempt in Progress

Presented below are data on three promissory notes.

Determine the missing amounts. $($Use $360$ days for calculation.$)$

$\backslash$table$[[,\backslash$table$[[$Date$],[$of$],[$Note$]],$Terms,Maturity Date,Principal,Annual Interest,Rate,,,Total Interest$],[($a$),\backslash$table$[[$April$],[1]],\backslash$table$[[60],[$days$]],,$$$510,000,8,14,\%,$$$,],[($b$),$July $2,\backslash$table$[[30],[$days$]],,81,600,,,\%,,$$$884$