Determine the tax-free amount of the monthly payment in each of the following instances. Use the life expectancy tables.

1. Person A is age 57 and purchased an annuity for $82,000. The annuity pays $600 per month for life.

2. Person B is 73 and purchased an annuity for $80,000. The annuity pays $950 per month for life.

3. Person C is 68 and purchased an annuity for $40,000 that pays a monthly payment of $550 for 10 years.