Subject: mathqa
Question: a shopkeeper buys mangoes at the rate of 4 a rupee and sells them at 3 a rupee . find his net profit or loss percent ?
Option: 
A: 73 1 / 3 %
B: 13 1 / 3 %
C: 33 1 / 3 %
D: 23 1 / 3 %
Answer: C