There is a vital sentence that is missing in the problem. Had it been present, the amount computed would not be the same.
Given:
28 years in service.
66 years old and has contributed 42,000 in her employer's qualified pension fund.
3,000 per month for the remainder of her life.
a) Retires June 2015 and collects six annuity payment.
3,000 x 6 months = 18,000 Gross income.
b) 3,000 x 12 months = 36,000
c) Income from annuity payments: 3,000 x 8 months = 24,000
Loss deductions: 3,000 x 4 months = 12,000