Jawabanmu

2014-06-18T20:29:32+07:00
Laba/penjualan = 2/3
x/300.000 = 2/13
13x = 600.000
x = 46.153,85
pembelian = laba + penjualan
= Rp. 646.153,85
atau
2+13= 15 -> 15/13=x/300.000 -> 13x = 4.500.000 -> pembelian= Rp.346.135,35
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:)
2014-06-18T21:19:16+07:00
300.000 : 15 = 20.000
laba = 40.000
300.000 - 40.000 = 260.000