Answer:
a. Month  Days
  April    21 (30 -9)
  May    31
  June    30
  July     31
  August   7
  Total     120 days
Thus, due date of the note is August 7
b. Interest    =  $2,560 [$96,000 * 8% * (120/360)]
 Principal   =  $96,000
Maturity value $98,560
c. Date   Account Titles         Debit     Credit
  Aug 7.  Cash                $98,560
            Note receivables            $96,000
            Interest revenue            $2,560