#
# Sep 16 homework 
# chap 2 exercise 7, pg 49
# Jim Mahoney's example solution.
#
# This is a modified version of the textbook's futval.py
#
print "--- chap2ex7.py : compound interest "
annual_interest_rate = input(
    "What is the annual percent interest rate? (i.e. 3.0) ")
annual_periods = input("How many periods are there per year? (i.e. 12) ")
interest_per_period = float(annual_interest_rate) / annual_periods
principal = input("What is the initial principal? (i.e. 100.00) ")
years = 10
for month in range(annual_periods * years):
    principal = (1.0 + interest_per_period/100.00) * principal
    print "   principal = ", principal, "after", (month+1), "months"
print "Done. After", years, "years, the principal is", principal