Answer: Option A
Gain in 1 year = Rs. 112.50
Answer: Option D
We need to know the S.I., principal and time to find the rate.
Since the principal is not given, so data is inadequate.
Answer: Option C
Let the principal be P and rate of interest be R%.
S.I. for 3 years = Rs. (12005 - 9800) = Rs. 2205.
Principal = Rs. (9800 - 3675) = Rs. 6125.