tong so phan bang nhau la
2 + 3 = 5 ( phan )
co so trung ga la
100 : 5 x 2 = 40 qua
co so trung vit la
100 - 40 = 60 qua
so tien ban trung ga la
1200 x 40 = 48000 dong
so tien ban trung vit la
1500 x 60 = 90000 dong
tong so tien ban duoc la
48000 + 90000 = 138000 dong