A - is the highest grade you can receive on an assignment, and it's between 90% and 100% B - is still a pretty good grade! This is an above-average score, between 80% and 89% ... D - this is still a passing grade, and it's between 59% and 69%
Use this calculator to find out the grade needed on the final exam in order to get a desired grade in a course. It accepts letter grades, percentage grades, and other numerical inputs.
D seems like the most reasonable answer since the company makes the ad look like their trying to send a message that they are trustworthy and can give your money back.
