1) Reva is a single taxpayer with a taxable pension of $22,000, tax-exempt interest of $10,000, and Social Security benefits of $10,000. What is the amount of her taxable Social Security benefits?

2) Suppose instead of 1), Reva receives no pension, $10,000 of tax exempt interest and $10,000 of Social Security benefits. What is the amount of her taxable Social Security benefits?

3) Suppose instead of 1) and 2), Reva receives $100000 in taxable pension and $10,000 of Social Security benefits. What is the amount of her taxable Social Security benefits?