Table:
0
A
B
C
1
Year ended September 30, 2019
Year ended September 30, 2018
2
Dividend yield
0%
0%
3
Weighted average expected volatility
37.77%
43.68%
4
Weighted average risk-free interest rate
2.92%
2.70%
5
Weighted average expected life (in years)
3.0
3.7
6
Vesting period (in years)
3.0
3.0

Questions and formulas:
Question: What is the average vesting period for 2018 and 2019?
Formula: (B6+C6)/2
Formula2: (B6+C6)/2
Level: Calculation
Question: What is the change in the percentage of weighted average expected volatility from 2018 to 2019?
Formula: B3-C3
Formula2: B3-C3
Level: Calculation