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a. 1000×5=5000
4×30=120
5000×120=600.000
30×10=300 600.000:300=2000:1000= 2
jadi, cony setiap hari memasukan 2 koin agar celengannya penuh dalam waktu 10 bulan
b.2×1000=2000×300=600.000 koin