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9. Stock Options and Warrants: Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions (Tables)
12 Months Ended
Apr. 30, 2016
Tables/Schedules  
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

 

Risk free interest rate

0.77% - 1.25%

Expected life in years

2.08 – 5.0

Dividend yield

0%

Expected volatility

123.41 - 138.42%