SOLUTION: A course at a local college has four exams. The first three each count for 20% of the final grade and the final exam counts for the remaining 40%. A student scored 68,78, and 88

Question 97981: A course at a local college has four exams. The first three each count for 20% of the final grade and the final exam counts for the remaining 40%. A student scored 68,78, and 88 out of 100 on the first three exams. What score(out of 100)does this student have to score on the final to ensure a cumulative grade of 80%.
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
let x=grade he has to get on the final.
68*.2+78*.2+88*.2+.4x=80
13.6+15.6+17.6+.4x=80
46.8+.4x=80
.4x=33.2
x=33.2/.4=83
Check:
46.8+83*.4=46.8+33.2=80
Ed
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