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6 + 3x < - 15
3x < - 15 - 6
3x < - 21 (bagi 3)
x < -7
no 25.
Harga akhir - Harga awal = 174.000 - 150.000 = 24.000
maka cari opsi a,b,c,d yang hasilnya 24.000
adalah 16% dengan cara :
16/100 x 150.000 = 24.000