Calculate interest earned and maturity amount for Recurring Deposit (RD) in Python

calculate-rd-interest.py

#!/usr/bin/env python3

monthly_installment = 30000

# 36 means one installment every month for 3 years
number_of_installments = 36

# Annual rate of interest
# e.g. 9.25%
r = 9.25

# number of compounding periods per year
# 
# monthly = 12
# quarterly = 4
# daily = 365
# half_yearly = 2
# yearly = 1
n = 4

# number of years
#t = 2.25

# if r=9, then r_computed is 9/100
r_computed = r/100.0

count = 1
final_maturity_amount = 0 
while count <= number_of_installments:
	t = (number_of_installments - count)/12.0
	individual_maturity_amount = monthly_installment * ((1 + (r_computed/n))**(n*t))
	final_maturity_amount = final_maturity_amount + individual_maturity_amount
	count = count + 1

print("Final maturity amount:", final_maturity_amount)
print("Interest earned:", final_maturity_amount-(monthly_installment*number_of_installments))