732.sagews

def amortization(loan, terms, rate):
  print "Balance".center(15)        + \
        "Payment".center(15)        + \
        "Principal_Paid".center(15) + \
        "Interest_Paid".center(15)  
  A = (loan * rate) / (1 - pow(1 + rate, -terms))
  for i in xrange(terms):
    P = loan * pow(1 + rate, i) - A * (pow(1 + rate, i) - 1) / rate
    R = P * rate
    print str(round(P, 2)).center(15)     + \
          str(round(A, 2)).center(15)     + \
          str(round(A - R, 2)).center(15) + \
          str(round(R, 2)).center(15) 

amortization(100, 10, 0.5)

Balance Payment Principal_Paid Interest_Paid 100.0 50.88 0.88 50.0 99.12 50.88 1.32 49.56 97.79 50.88 1.99 48.9 95.81 50.88 2.98 47.9 92.83 50.88 4.47 46.42 88.36 50.88 6.7 44.18 81.66 50.88 10.05 40.83 71.61 50.88 15.08 35.81 56.54 50.88 22.61 28.27 33.92 50.88 33.92 16.96