The more you study for the given exam, better your performance on it. If you study for 10 hours, score will be 65%. If you study for 20 hours, the score will be 95%. You can get as close as you wish to the perfect score simply by studying long enough. Suppose the percentage score,p(n), is the function of number of hours, n, that you study in form p(n)=an+b/cn+d. If you wish the score of 80%, how long do you require to study?