Una Day is planning to retire in 20 years, at which time she hopes to have accumulated enough money to receive an annuity of $12,000 a year for 25 years of retirement. During her pre-retirement period she expects to earn 8 percent annually, while during retirement she expects to earn 10 percent annually on her 39. ey. What annual contributions to this retirement fund are required for Una to achieve her objective and sleep well at night? mon