The average age of a class is 12 years and total age is 300 years. If a student of age 15 years is now admitted then find the average of the new class?

1. A Option A: 12.11 years
2. B Option B: 11.12 years
3. C Option C: 13.12 years
4. D Option D: 10.13 years
5. E Option E: none

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