A man borrowed an amount from a private institution at 5% simple interest per annum. He lent 50% of this amount to another person at 10% compound interest per annum and thus earned a profit of Rs.3205 in 4 years. How much amount did the man borrow?

• A. 80, 000 रु.
• B. 1, 00, 000 रु.
• C. 1, 20, 000 रु.
• D. 1, 50, 000 रु.