#
# 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 = float(input(
    "What is the annual percent interest rate? (i.e. 3.0) "))
annual_periods = int(input(
    "How many periods are there per year? (i.e. 12) "))
interest_per_period = annual_interest_rate / annual_periods
principal = float(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/100.0) * principal
    print("   principal = ", principal, "after", (month+1), "months")
print("Done. After", years, "years, the principal is", principal)