Ram bought 1600 eggs at Rs. 3.75 per dozen. He sold 900 of them at 2 for Re.1 and the remaining at 5 for Rs. 2. His gain per cent is:

Total cost price of all 1600 eggs = (1600/12)*3.75 = 500
Now, 900 eggs were sold for 2 eggs for Re 1 or 1 egg for Rs.0.6. Hence selling price of 900 eggs = 0.5*900 = 450
Also, remaining 700 egs were sold for 5 eggs at Rs. 2 or 1 egg at Rs.0.4, their selling price = 700*0.4 = 280
Now, total selling price for 1600 eggs = 450+280 = 730
Percent Profit = $$\frac{730-500}{500}$$= 46
Therefore, the correct option is option D.