Tukukkk

I'm new to Python and coding in general. I am trying to use a while loop with a nested for loop to calculate the lowest % of salary that can be saved that will reach the savings goal within 36 months. The code also includes functions to apply a semi-annual raise to the salary every 6 months and to apply interest gained to the savings.

When I run my code it results in an infinite loop and I haven't been able to see what is causing it.

total_cost = 1000000

semi_annual_raise = 0.07

down_payment = 0.25*total_cost

starting_salary = float(input("What is your annual salary?: "))

monthly_salary = starting_salary/12.0

r = 0.04

steps = 0

epsilon = 100

low = 0

high = 10000

portion_saved = (high + low)/2.0

current_savings = 0

raise_counter = 0



while abs(current_savings - down_payment) > epsilon:

    current_savings = 0



    for months in range(36):

        current_savings += (current_savings*r/12) + (monthly_salary* 

        (portion_saved/10000))



        if raise_counter == 6:

            monthly_salary += monthly_salary*semi_annual_raise

            raise_counter = 0

        raise_counter += 1



    if current_savings < down_payment:

        low = portion_saved

    else:

        high = portion_saved

    portion_saved = (high + low)/2.0

    steps += 1

    raise_counter = 0

print ("Number of steps =", steps)

print ("Optimal % to save:", portion_saved/10000)

Why have you used (monthly_salary*portion_saved/10000 ? Since you need to add the portion_saved to the current_savings each month, i would recommend you to use

current_savings+=(current_savings*r/12) + portion_saved

I think you can also simplify the process by finding the % to be saved using the below formula

monthly_salary*(save_percent/100)* 36 = down_payment-epsilon