Una Day is planning to retire in 10 years, at which time she hopes to have accumulated enough money to receive an annuity of $20,000 a year for 15 years of retirement. During her pre-retirement period she expects to earn 11 percent annually, while during retirement she expects to earn 13 percent annually on her money.

What annual contributions to this retirement fund are required for Una to achieve her objective and sleep well at night? (Use a Financial calculator to arrive at the answer. Do not round intermediate calculations. Round the final answer to the nearest whole dollar.)

Annual contribution $