Work out your course grade from weighted components and what you need on the final.
Each score is multiplied by its weight, those products are summed, and the total is divided by the sum of the weights. If your weights add up to 100, that's your final percentage grade.
Weighted grade = Σ(score × weight) ÷ Σ(weights)
Not necessarily — the calculator divides by whatever the weights sum to, so relative weights work too. But for a true final grade, they should total 100%.
Enter your known scores and weights, then add the final exam with its weight and try different scores to see the grade each would produce.