im having issues implementing the bisection method in pset4 of the 4th part of the question , any advice would be helpful

Question

anonymous · Answer

you start retirement with x kongbucks
you want your kongbucks to last n years
you make a guess as to how much you can spend:
    the range of you guess the first time around is 0 to x kongbucks
    the first guess might be 1/2 of x
plug that number into the solutions for the previous problems
if the guess was too much or too little, adjust the range for your next guess; repeat

anonymous · Answer

Video lectures 5 and 6. 

Use codepad.org to share your attempt if you are stuck.

And bwCA explains it decently in pseudocode