Final answer:
If you did not spend a third of your income on interest fees, you could invest in savings or retirement accounts, use it for leisure activities and hobbies, and allocate it towards education or skill development.
Step-by-step explanation:
If you did not spend a third of your income on interest fees, you could do various things with that money. Firstly, you could invest in savings or retirement accounts to secure your financial future. Secondly, you could use it for leisure activities and hobbies to enhance your personal enjoyment. Additionally, you could allocate it towards education or skill development to further your knowledge and career prospects.