500
President of the U.S., Hebert Hoover, wrote a letter of appreciation to the church for this.
What is... the contribution of wheat and flour for war use?
*All of the wheat and flour donated was gathered and paid for by the Relief Society. The US government later paid the church $1.20 for each bushel donated which was estimated at 205,528 bushels. The money received was invested as a trust fund made available for charitable purposes for the poor of the church.