The following table shows the history of account balances, deposits, and withdrawals for a fund:

Date	Value Before Deposit/Withdrawal	Deposit (+)/ Withdrawal (-)
January 1, 2016	1,000	0
March 11, 2016	X	500
January 1, 2017	1,400

The dollar-weighted rate of return (based on simple interest) and the time-weighted rate fo return for this fund during 2016 were equal.

What is the value of X?

(Assuming 30-day months.)