Soal SMA · Soal cerita · Kesulitan 3/5

A student has a 90% average in a course. The final exam is worth 20% of the grade. What minimum score must the student get on the final to have an overall average of at least 85%?

A.65%
B.70%
C.75%
D.80%

Kunci jawaban & pembahasan

Jawaban: 65%

Let x be final score. 0.8(90) + 0.2x ≥ 85 → 72 + 0.2x ≥ 85 → 0.2x ≥ 13 → x ≥ 65.

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