Answer:
Payment = Pmt(8%, 4, -30000) = $9,057.62
Interest Paid = Beginning amount * 8%
Principal paid = Payment - Interest Paid 
End Balance = Beg Amount - Payment  
Payment  Beg Amount  Payment  Interest paid  Principal paid  End Balance
1                 30,000       $9,057.62    2,400           6,657.64            23,342.38
2                23,342.38  $9,057.62    1,867.39        7,190.23            16,152.14
3                16,152.14     $9,057.62    1,292.12         7,765.45           8,386.69
4                8,366.39     $9,057.62    670.94           8,386.69             -