Jawabanmu

2014-02-18T15:47:33+07:00
Misalkan harga pembelian saya simbolkan Hb dan harga jualnya Hj

 \frac{35}{100} . Hb = 280.000
 \frac{35Hb}{100} = 280.000
35Hb = 28.000.000
Hb = 800.000

Hj = keuntungan + Hb
Hj = 280.000 + 800.000
Hj = 1.080.000