tolong bantu saya pakai cara juga ya

10) bunga per tahun = 20% × 180.000
= 20/100 × 180.000
= 36.000
bunga 6 bln = 6/12 × 36.000
= 18.000
uang ibu selama 6 bulan
= 180.000 + 18.000
= 198.000 ( C)

11) 18 = 2 × 3²
27 = 3³
54 = 2 × 3³
kpk = 2 × 3³ = 2 × 27 = 54 (A)

12) 15 = 3 × 5
20 = 2² × 5
kpk = 2² × 3 × 5 = 60 hari
= 2 bulan lagi (C)

13) 30 = 2 × 3 × 5
75 = 3 × 5²
90 = 2 × 3² × 5
FPB = 3 × 5 = 15 (B)

11.kpk= 2 x 3 x 3 x 3
=54
12.kpk dari 15 dan 20
=2 x 2 x 3 x 5
= 60 = 2 bulan ( jawaban C )
13.FPB = 3 x 5
= 15 ( jawaban B )