Table:
0
A
B
C
D
1
Year ended December 31,
2
2019 (1)
2018
2017
3
Revenues
$59.5
$57.6
$56.8
4
Operating expenses
12.5
12.1
12.3
5
Guarantee fee
—
—
1.2

Questions and formulas:
Question: What was the percentage change in operating expenses between 2018 and 2019?
Formula: (B4-C4)/C4
Formula2: (B4-C4)/C4
Level: Calculation