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sak semen dibeli ayah : 50 sak semen.
harga seribu batako = 100.000 : 1000 = 100 / batako.
jika ayah membeli 25.000 batako = 25.000 x 100 = 2.500.000 rb
sak semen = 50 x 25000 = 1.250.000
seluruh nya = 2.500.000 + 1.250.000 = 3.750.000 rupiah