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salah : -2
tdk dijawab : -1
a. siswa A = dijawab 45 soal : benar : 35 x 4 = 140
salah : 45-35 =10 x 2 =-20
tdk dijawab : 50 - 45 = 5 x -1 = -5
140 - 20 - 5 = 15
jadi, nilai siswa A adalah 115