You currently have $$80,000$ which you will need to cover your expenses over the next $4$ years of your studies. The funds are in an account paying $10\%$ per year. You estimate the cost in the first year to be $$20,000$ but you aren$$t sure about the costs for the remaining three years. You would like to know how much you could withdraw annually $($as an equal annual sum$)$ for each of the remaining three years. Find the annual withdrawal you could afford for those final $3$ years $($within $$200).$