A dishonest shopkeeper professes to sell pulses at the cost price, but he uses a false weight of 970gm. for a kg.His gain is …%.	Choose the correct answer.
A) 3.09 %
B) 5.36 %
C) 4.26 %
D) 6.26 %
E) 7.26 %

Rationale: "his percentage gain is 100 * 30 / 970 as he is gaining 30 units for his purchase of 970 units . so 3.09 % . answer : a"
Answer: A