How are weighted grades calculated?

If I have 3 assignments in a weighted grade category, how are those calculated. So for instance I have three assignments in a weighted grade category that is worth 50% of my class grade. one assignment s 100 points, one is 40, and one is 10. I score 100 on the first, 40 on the second and 5 on the third. Would my average for that weighted category be 96.7 (145/150) or would it be 83.33 (the average of 100%, 100%, 50%)?
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