Question

From Zelle chapter 8:

Write a program that uses a while loop to determine how long it takes for an investment to double
at a given interest rate. The input will be an annualized interest rate, and the output is the number of
years it takes an investment to double. Note: the amount of the initial investment does not matter; you
can use $1.

Hint: Chapter 2 futval.py has code with a for-loop that computes the value of an investment over 10 years.
That program shows how an investment grows form one year to the next.
futval.py used eval to covert the rate that was input, but you should use float.

Answer 1

*** Please Give proper indentation, as shown in the image of the code ***

####################################################################################################

# Function to calculate Simple Intrest
def Simple_Intrest(principle_amount, rate_interest, investment_years):
intrest = (principle_amount*rate_interest*investment_years)/100 # Formula for simple intrest
final_amount=principle_amount+ intrest # calculating Final amount
return final_amount

# main function
def main():
# input
principle_amount=float(input("Please Enter The Principle Amount : "))
rate_interest=float(input("Please Enter The Rate Of Intrest : "))
cur_amount=principle_amount
investment_years=0

# while loop to calculate answer
while cur_amount < 2*principle_amount:
investment_years+=1
cur_amount=Simple_Intrest(principle_amount, rate_interest, investment_years)
# Answer
print("{} take {} years to be doubled witn an intrest of {}".format(principle_amount, investment_years, rate_interest))

  
main()

####################################################################################################

Output :