A person purchases some article at the rate of rupees 5 per 4 articles and sells them at the rate of rupees 4 per 5 articles. Find the total profit or loss in %.

36 % loss

The correct answer is Option 4: 36 % loss

CP of 4 articles = Rs 5

CP of 20 articles = Rs 25

SP of 5 articles = Rs 4

SP of 20 articles = Rs 16

Since CP > SP, there is a loss.

Loss% =  \(\frac{CP_{20}-SP_{20}}{CP_{20}}\) * 100

Loss% =  \(\frac{\text{25-16}}{25}\) * 100

Loss% = \(\frac{9 }{25 }\) * 100

Loss% = 36%