The cost price of two dozen bananas is ₹32. After selling 18 bananas at the rate of ₹12 per dozen, the shopkeeper reduced the rate to ₹4 per dozen. The loss percent is:

37.5%

CP of 24 bananas = Rs. 32

SP of 18 bananas (Rs. 12 per dozen) = 12 + 6 = Rs. 18

SP of remaining 6 bananas (Rs. 4 per dozen) = Rs. 2

SP of 24 bananas = 18 + 2 = Rs 20

Loss% = \(\frac{12}{32}\) × 100 = \(\frac{3}{8}\) × 100 = 37.5%