Task: Question Answering
Input (English): Problem: a person borrows 20000 for 6 years at 8 % p. a. simple interest. he immediately lends it to another person at 9 % p. a. for 6 years. find his gain in the transaction per year.
Options: a. 200, b. 250, c. 210, d. 190, e. 180
Output (English): a