how are grades weighted?
 The weighted grade is equal to the sum of the product of the weights (w) in percent (%) times the grade (g):Weighted grade = w 1 × g 1 + w 2 × g 2 + w 3 × g 3 +... When the weights are not in percent (hours or points...), you should also divided by the sum of the weights:Weighted grade = (w 1 × g 1 + w 2 × g 2 + w 3 × g 3 +...) / (w 1 + w 2 + w 3 +...). 