bisection_min_payment

balance = 320000
annualInterestRate = 0.2
monthlyInterestRate = annualInterestRate/12
newbalance = balance
epsilon = 0.01
low = 0
high = balance
ans = (high + low)/2.0

while abs(high - low) > epsilon:
    newbalance = balance
    for n in range(12):
        unpaid = newbalance - ans
        newbalance = unpaid + (unpaid * monthlyInterestRate)
    if newbalance > 0:
        low = ans
    else:
        high = ans
    ans = (high + low)/2.0
print("Lowest payment: " + str(round(ans, 2)))