Table:
0
A
B
C
D
1
($ in millions)
Percent
2
For the year ended December 31:
2019
2018
Yr.-to-Yr. Percent Change
3
Licensing of intellectual property including royalty-based fees
$367
$723
(43.2)%
4
Custom development income
246
275
(10.5)
5
Sales/other transfers of intellectual property
34
28
22.6
6
Total
$648
$1,026
(36.9)%

Questions and formulas:
Question: What was the Licensing of intellectual property including royalty-based fees average?
Formula: (B3 + C3) / 2
Formula2: (B3 + C3) / 2
Level: Calculation
Question: What was the increase / (decrease) in the Custom development income from 2018 to 2019?
Formula: B4 - C4
Formula2: B4 - C4
Level: Calculation
Question: What was the increase / (decrease) in the Sales/other transfers of intellectual property from 2018 to 2019?
Formula: B5 - C5
Formula2: B5 - C5
Level: Calculation