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Derivative liability (Tables)
12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Schedule of assumption used in Black Scholes

The following assumptions were used in the Black-Scholes valuation model:

 

    Year ended
December 31,
2019
     
Calculated stock price     $0.05 to $0.09  
Risk free interest rate     1.43% to 2.56%  
Expected life of convertible notes and warrants     3 to 60 months  
expected volatility of underlying stock     102.3% to 687.3%  
Expected dividend rate     0 %
Schedule of derivative liability

The movement in derivative liability is as follows:

 

    December 31,
2019
  December 31,
2018
         
Opening balance   $ 4,618,080     $ 2,859,832  
Derivative liability on issued convertible notes and variable priced warrants     1,477,163       1,335,709  
Fair value adjustments to derivative liability     2,599,029       422,539  
                 
Closing balance   $ 8,694,272     $ 4,618,080