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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Revenues |  |  |  |
Net revenues | $ 5,854 | $ 5,494 | $ 11,908 | $ 11,000
Operating Expenses |  |  |  |
Personnel | 940 | 894 | 1,922 | 1,701
Marketing | 235 | 241 | 509 | 517
Network and processing | 183 | 171 | 364 | 344
Professional fees | 103 | 101 | 209 | 192
Depreciation and amortization | 192 | 160 | 374 | 319
General and administrative | 269 | 264 | 582 | 540
Litigation provision (Note 14) | 8 | 22 | 8 | 29
Total operating expenses | 1,930 | 1,853 | 3,968 | 3,642
Operating income | 3,924 | 3,641 | 7,940 | 7,358
Non-operating Income (Expense) |  |  |  |
Interest expense, net | (118) | (140) | (229) | (285)
Investment income and other | 23 | 176 | 92 | 234
Total non-operating income (expense) | (95) | 36 | (137) | (51)
Income before income taxes | 3,829 | 3,677 | 7,803 | 7,307
Income tax provision (Note 13) | 745 | 700 | 1,447 | 1,353
Net income | $ 3,084 | $ 2,977 | $ 6,356 | $ 5,954
Class A common stock |  |  |  |
Earnings Per Share |  |  |  |
Basic earnings per share (in dollars per share) | $ 1.39 | $ 1.31 | $ 2.85 | $ 2.61
Basic weighted-average shares outstanding (in shares) | 1,703 | 1,748 | 1,708 | 1,754
Diluted earnings per share (in dollars per share) | $ 1.38 | $ 1.31 | $ 2.85 | $ 2.61
Diluted weighted-average shares outstanding (in shares) | 2,228 | 2,279 | 2,234 | 2,285
Class B common stock |  |  |  |
Earnings Per Share |  |  |  |
Basic earnings per share (in dollars per share) | $ 2.25 | $ 2.13 | $ 4.62 | $ 4.25
Basic weighted-average shares outstanding (in shares) | 245 | 245 | 245 | 245
Diluted earnings per share (in dollars per share) | $ 2.25 | $ 2.13 | $ 4.62 | $ 4.25
Diluted weighted-average shares outstanding (in shares) | 245 | 245 | 245 | 245
Class C common stock |  |  |  |
Earnings Per Share |  |  |  |
Basic earnings per share (in dollars per share) | $ 5.54 | $ 5.23 | $ 11.40 | $ 10.44
Basic weighted-average shares outstanding (in shares) | 11 | 12 | 11 | 12
Diluted earnings per share (in dollars per share) | $ 5.54 | $ 5.23 | $ 11.38 | $ 10.42
Diluted weighted-average shares outstanding (in shares) | 11 | 12 | 11 | 12

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