tolong isi caranya !

100% - 45% + 0,25
100% - 45% + 25%
100% - 70%
30%

30% = 30/100 = 3/10bagian

0,25 = 25/100 = 25 persen
45  persen + 25 persen = 70 persen
buku pelajaran = 100 persen - 70 persen = 30 persen
30 persen = 30/100 = 3/10

semoga membantu