Warrants to Purchase Common Stock (Tables)

6 Months Ended

Nov. 30, 2016

Warrants To Purchase Common Stock

Schedule of Fair Value for the Warrants and Stock Options, Valuation Assumptions

The value of Greystone’s common stock on September 1, 2016 was $0.24 per share. The estimated fair value at the date of the grant for the warrants utilizing the Black-Scholes option valuation model and the assumptions that were used in the Black-Scholes option model for fiscal year 2017 are as follows:

Estimated fair value of warrants at date of grant	$	120,000
Black-Scholes model assumptions
Average expected life (years)		6
Average expected volatility factor		145.77	%
Average risk-free interest rate		4.0	%
Average expected dividend yields	$	-0-