Task: Question Answering
Input (English): Problem: a person borrows rs. 7000 for 2 years at 4 % p. a. simple interest. he immediately lends it to another person at 6 p. a for 2 years. find his gain in the transaction per year.
Options: a. 100 rs, b. 150 rs, c. 140 rs, d. 180 rs, e. 200 rs
Output (English): c