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maaf kalau hasilnya salah
= 7/12 x 74.400
= 7 x 6.200
= 43.400 rupiah
b) harga 10 kg
= 10/12 x 74.400
= 10 x 6.200
= 62.000 rupiah
jadi, sisa uang kmbaliannya = 100.000 - 62.000 = 38.000 rupiah