A vendor sold 5 chocolates for ₹1, thereby gaining 20%. How many chocolates did he buy for ₹1?

Correct option is D

Given:

Selling rate: 5 chocolates for ₹1 

Profit = 20%

Solution:

Profit 20% 

$$\text{CP}:\text{SP}=100:120=5:6$$​​
If SP gives 5 chocolates per ₹1, then CP must give 6 chocolates per ₹1.