Table:
0
A
B
C
D
1
Year Ended
2
January 3, 2020
December 28, 2018
December 29, 2017
3
Weighted average grant-date fair value
$11.89
$13.85
$11.53
4
Expected term (in years)
4.4
4.7
4.7
5
Expected volatility
24.3%
26.6%
29.7%
6
Risk-free interest rate
2.4%
2.6%
1.9%
7
Dividend yield
2.2%
2.0%
2.5%

Questions and formulas:
Question: What was the average Expected volatility in 2018 and 2017?
Formula: (C5 + D5) / 2
Formula2: (C5 + D5) / 2
Level: Calculation
Question: What was the change in the Risk-free interest rate from 2017 to 2018?
Formula: C6 - D6
Formula2: C6 - D6
Level: Calculation