Jawabanmu

2014-04-17T20:00:29+07:00
Harga beli = Penjualan - keuntungan
Hb = 1.800.000 - 20%Hb
Hb = 1.800.000 - 1/5 Hb
6/5 Hb = 1.800.000
Hb = 1.800.000 X 5/6
Harga beli = 1.500.000
2014-04-17T20:33:26+07:00
Keuntungan = 20/100*hb=1/5hb..... hj=hb+untung……………… 1800000=hb+1/5hb………………… 1800000=6/5hb……………………… hb=1800000*5/6=1500000