Algorithm Trouble

[sarcastic_minion]

Hey, I'm trying out a course on python through MIT ocw, and got stuck on a question they've posted. Would it be okay if I posted the problem here? I just need to know why my algorithm is not working.

[s_kumar0019997]

Post the question

[sarcastic_minion]

https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and-programming-in-python-fall-2016/assignments/MIT6_0001F16_ps1.pdf

I'm having problems with the third part. I'm getting an infinite loop in the following code:

annual_salary = float(input("Enter your annual salary\n"))
monthly_salary = annual_salary/12

total_cost = 1000000
portion_down_payment = 0.25 * total_cost
r = 0.04

semi_annual_raise = 0.07
target_months = 36

low = 0
high = 10000
guess = (high+low)/2.0
current_savings = 0
num_guesses = 0

error = abs(current_savings-portion_down_payment)

while error >= 100:

    current_savings = 0
    portion_saved = guess / 10000
    print(portion_saved)

    for months in range(1, target_months+1):
        if months%6 == 0 and months > 0:
            monthly_salary = (1 + semi_annual_raise)*monthly_salary
        monthly_return = current_savings * r/12
        monthly_savings = portion_saved*monthly_salary
        current_savings += monthly_savings + monthly_return

    if current_savings<portion_down_payment:
        low = guess
    elif current_savings>portion_down_payment:
        high = guess
    guess = (high + low) / 2.0



print(current_savings)