Annual deposits are made into a fund at the end of each year. The first deposit is $1,000. Each subsequent deposit is $50 lower than the one preceding it. The last deposit is $50. Beginning 1 year after the last deposit is made, the fund distributes $2,100 each year until the fund is exhausted.

Assume the fund earns an effective annual interest rate of 6%.

How many full or partial distributions does the fund make?

Possible answers are 16, 17, 18, 19, or 20. Thanks!