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Accounting for Stock-Based Compensation (Tables)
9 Months Ended
Feb. 29, 2020
Accounting for Stock-Based Compensation  
Schedule of assumptions used in the Black-Scholes option pricing model to estimate the fair value of stock option grant

Risk-free interest rate

    

1.9

Expected volatility of common stock

32.0

%

Dividend yield

0.8

Expected option term in years

4.5