What grade would I need on my final to get a B in the class?

85x0.92=78.2% in the class before but also including the final. therefore u can walk in, write your name on it, hand it in, and leave the class with a B+. you get 50% on the final= 4% of total final grade. then you have a 82.2% in class which equals a A-. so good work, no matter what, you have a B+.