The Bank contributes 80% of the project and Hassan contributes 20% of the project. Profits are distributed as follows: 20% for the bank and 80% for the partner Hassan. He manages the project. The annual profit is 10% of the total capital of the project. The partner Hassan pays 75% of his profits as a purchase of the bank's shares in the bank at the historical value. Required: (Solution condition: without substitution in numbers) 1. Number of years of participation. 2. The proportion of what the partner has repaid from his profits in the last year of participation. 3. Repeat what is required in item (1) and (2) if the annual profits decrease by 2% each year