Jawapan

2015-10-09T10:56:26+08:00
Diskaun = 30%

harga asal pen
= 10.15 X 100/70
= RM14.50
2015-10-09T20:45:14+08:00
10.15=70%
10.15÷70=0.145 sen 
0.145×100%=RM14.5