First, express the percentages in decimal form:
5 / 100 = 0.05
25/100 = 0.25
20/100= 0.2
50/100 = 0.5
Now, multiply each grade and add.
(0.05 x 95 ) + ( 0.25 x 89 ) + (0.20 x 80 ) + (0.5 x 79 ) =
4.75 + 22.25 + 16 + 39.5 = 82.5 = 83
Answer = 83
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