On Jan. 1 2022, Henry took out a 10,000 loan. He immediately used 5,000 of the proceeds to buy business assets and used 5,000 of the proceeds to purchase stock in the stock market. On Jan. 1, 2023, Henry paid back 5,000 of the 10,000 bank loan. What is the character of the interest on the remaining 5,000 loan?
1) All business interest
2) All investment interest
3) Cannot be determined