Table:
0
A
B
C
D
1
January 31, 2019
January 31, 2018
2
(in millions)
ASC 606
ASC 605
ASC 605
3
Deferred revenue
$2,091.4
$2,269.2
$1,955.1
4
Unbilled deferred revenue
591.0
491.6
326.4
5
Total deferred revenue
$2,682.4
$2,760.8
$2,281.5

Questions and formulas:
Question: What is the percentage of total revenue that comes from unbilled deferred revenue as of January 31, 2018?
Formula: (D4/D5) 
Formula2: (D4/D5) 
Level: Calculation
Question: What is the difference between the unbilled deferred revenue for ASC 605 from January 31, 2018 to January 31, 2019?
Formula: C4-D4 
Formula2: C4-D4 
Level: Calculation
Question: What is the average deferred revenue from 2018 to 2019 under ASC 605?
Formula: (C3+D3)/2 
Formula2: (C3+D3)/2 
Level: Calculation