Table:
0
A
B
C
D
1
Fiscal Year Ended January 31,
2
2019
2018
2017
3
(Unaudited)
4
Gross profit
$2,283.9
$1,753.2
$1,689.1
5
Non-GAAP gross profit
$2,317.0
$1,785.5
$1,743.2
6
Gross margin
89%
85%
83%
7
Non-GAAP gross margin
90%
87%
86%
8
Loss from operations
$(25.0)
$(509.1)
$(499.6)
9
Non-GAAP income (loss) from operations
$316.0
$(112.0)
$(125.5)
10
Operating margin
(1)%
(25)%
(25)%
11
Non-GAAP operating margin
12%
(5)%
(6)%
12
Net loss
$(80.8)
$(566.9)
$(582.1)
13
Non-GAAP net income (loss)
$223.3
$(106.3)
$(111.0)
14
Diluted net loss per share
$(0.37)
$(2.58)
$(2.61)
15
Non-GAAP diluted net income (loss) per share
$1.01
$(0.48)
$(0.50)
16
GAAP diluted weighted average shares used in per share calculation
218.9
219.5
222.7
17
Non-GAAP diluted weighted average shares used in per share calculation
222.0
219.5
222.7

Questions and formulas:
Question: What was the percentage increase in gross profit from 2018 to 2019?
Formula: (B4-C4)/C4
Formula2: (B4-C4)/C4
Level: Calculation
Question: What is the total sales in 2017?
Formula: D4/83% 
Formula2: D4/83% 
Level: Calculation
Question: How much did gross margin change from fiscal year ending January 31, 2019 compared to the prior year?
Formula: B6-C6
Formula2: B6-C6
Level: Calculation