85+65+70+70+77+76+75+75+77+75+75=820
75×12=900
900-820=80
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80
cari total nilai siswa tanpa Andi
85+65+70+70+77+76+75+75+77+75+75=820
cari total nilai siswa dengan andi
75×12=900
kurangi total nilai dengan andi dan tanpa andi
900-820=80