What is the loss percent incurred when chocolates got at 2 for a rupee are sold at 4 for a rupee?

Correct option is B

2 chocolates CP = Rs. 1
4 chocolates SP = Rs. 1
For equate both equation
4 chocolates CP = Rs. 2
4 chocolates SP = Rs. 1
Loss % = (CP-SP)/CP ×100=(2-1)/2×100 =50%