Ann would like to have $20,000 saved in 7 years from today and can earn 3.8% on deposits. She plans to make sporadic deposits of $2,000 one year from today, $2,500 3 years from today, $500 at year 7. She plans to make one additional payment 4 years from today. How much must she deposit in 4 years to meet her goal? enter your answer as a positive number