How do I write this problem?

Question

to receive a grade B- in a math course, you must have a mean of 83 on five tests (4 tests + one final) all 100 pts maximum each. Your scores thus far are 85,79,82,and 81. How many points must you have on the final, to earn the B-? write down your work..

Ms. Sue · Answer

0.83 * 500 = 415 You need a total of 415 points. Your test grades so far = 327 415 = 327 = 88 You need at least a score of 88 on the final.

Anonymous · Answer

thank you ms. Sue.. the four scores threw me off and wasn't sure how to start the formula or problem

Ms. Sue · Answer

You're welcome. I just noticed that I have a typo: 415 - 327 = 88

Anonymous · Answer

thank you you are a life saver