Subject: mathqa
Question: irin , ingrid and nell bake chocolate chip cookies in the ratio of 9.18 : 5.17 : 2.05 . if altogether they baked a batch of 170 cookies , what percent of the cookies did irin bake ?
Option: 
A: 0.152 %
B: 53.5 %
C: 1.25 %
D: 0.125 %
Answer: B