Average cost of 100 eggs is 2 rupees. It is lowered to 1.5 on buying an additional 100 eggs. What is the difference of cost of additional 100 eggs and previously purchased 100 eggs?

1. A Option A: Rs. 40
2. B Option B: Rs. 50
3. C Option C: Rs. 150
4. D Option D: Rs. 100
5. E Option E: none

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