Question:
An egg seller sells his eggs only in the packs of 3 eggs, 6 eggs, 9 eggs, 12 eggs etc., but the rate is not necessarily uniform. One day Raju (which is not the same egg seller) purchased at the rate of 3 eggs for a rupee and the next hour he purchased equal number of eggs at the rate of 6 eggs for a rupee. Next day he sold all the eggs at the rate of 9 eggs for Rs. 2. What is his percentage profit or loss?

Option A):
3% loss
Option B):
10% loss
Option C):
11.11% loss
Option D):
2.5 % profit

Correct Answer is Option C):
11.11% loss

Explanation:
CP of one egg in first case = 1/3 = 33.33 paise
CP of one egg in second case = 1/6 = 16.66 paise
Average CP = (33.33 +16.66)/2 = 25 paise
Selling price of 9 eggs = Rs. 2
SP of one egg = 200/9
Profit or loss = [(25 - (200/9))*100]/25
Profit or loss = -11.11. (loss)