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maka,
130/100*y=390.000
y= 390.000*100/130
y= 300.000
harga pembelian = Rp300.000,00
Untung penjualan = Rp.390.000 x 30/100= 117.000
Harga pembelian= harga jual - keuntungan = Rp.390.000 - Rp.117.000 =Rp.273.000