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150 - 30 = Tidak biru
120 = tidak biru
= 120 / 150 * 100%
= 4 / 5 * 100%
= 80%
cara :
150-30=120
120:150x 100%
--> 120: 3= 4
--> 150: 3= 5
4/5x100%= 80%