Jawabanmu

2014-06-05T19:30:32+07:00
84.000 x 5% = 4.200
84.000 - 4.200 = 79.800
2014-06-05T19:32:37+07:00
Untung= 5/100 x 84000 = 4200
harga beli= harga jual-untung = 84000 - 4200 = Rp 79800