1.If the interest rate is 7.5%, the 1-year discount factor is equal to ________.

2.If the interest rate is 7.5%, the 10-year discount factor is equal to ________.

3. If the 1-year discount factor is 0.8, the interest rate must be equal to ________.

4.If the 5-year discount factor is 0.8, the interest rate must be equal to ________.