Jawabanmu

2014-09-04T17:41:04+07:00
25 %  =  (15/20 ) . 1000 x 100% =
         =  3/4 x 100 %
         = 75%
maka 100 % - 75 % = 25 %
1 per 5 dikali 100% per 1
=100 per 5
=20%
Aku ksh tw ya rumusnya
he em
2014-09-04T17:46:19+07:00
20000:100=200
20000-15000=5000
200x...=5000
5000:200= 25%