Subject: mathqa
Question: niall ' s income is 60 % less than rex ' s income , and sam ' s income is 25 % less than niall ' s income . if rex gave 60 % of his income to sam and 40 % of his income to niall , niall ' s new income would be what fraction of sam ' s new income ?
Option: 
A: 12 / 13
B: 8 / 9
C: 11 / 12
D: 8 / 13
Answer: B