Fritz Burnett participates in his employer's 401(k) plan and would like to borrow the maximum amount possible from his account balance. How much can he borrow currently in the following independent cases?

1. He is vested in the amount of $7,000

2. He is vested in the amount of $70,000

3. He is vested in the amount of $150,000

4. He is vested in the amount of $200,000, but he borrowed $100,000 three years ago and 12 months ago his loan balance was $37,000