Jawabanmu

2014-09-07T18:24:42+07:00
Keuntungan = harga penjualan - harga pembelian = 150.000 - 120.300 = 29700
keuntungan = 29700 / 120300 x 100% = 24% 
2014-09-07T18:24:52+07:00
Keuntungan = 150000 - 120000
                       = 30000

presentase = (30000/150000) x 100
                       = 20 %