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CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Revenue: |  |  |
Revenue | $ 540,536 | $ 445,732 | $ 394,912
Cost of sales: |  |  |
Cost of sales | 367,022 | 304,496 | 230,354
Gross margin: |  |  |
Total gross margin | 173,514 | 141,236 | 164,558
Selling, general and administrative | 131,905 | 96,434 | 67,481
Research and development | 64,255 | 54,689 | 53,764
Impairment of goodwill | 156,017 |  |
(Loss) income from operations | (178,663) | (9,887) | 43,313
Other (loss) income: |  |  |
Interest expense, net | (9,368) | (5,440) | (618)
Other expense, net | (346) | (10,313) | (8,330)
Sale of ownership in HAPSMobile Inc. joint venture |  | 6,497 |
(Loss) income before income taxes | (188,377) | (19,143) | 34,365
(Benefit from) provision for income taxes | (14,663) | (10,369) | 539
Equity method investment (loss) income, net of tax | (2,453) | 4,589 | (10,481)
Net (loss) income | (176,167) | (4,185) | 23,345
Net income attributable to noncontrolling interest | (45) | (3) | (14)
Net (loss) income attributable to AeroVironment, Inc. | $ (176,212) | $ (4,188) | $ 23,331
Net (loss) income per share attributable to AeroVironment, Inc. |  |  |
Basic (in dollars per share) | $ (7.04) | $ (0.17) | $ 0.97
Diluted (in dollars per share) | $ (7.04) | $ (0.17) | $ 0.96
Weighted-average shares outstanding: |  |  |
Basic (in shares) | 25,044,881 | 24,685,534 | 24,049,851
Diluted (in shares) | 25,044,881 | 24,685,534 | 24,362,656
Product sales |  |  |
Revenue: |  |  |
Revenue | $ 353,062 | $ 240,683 | $ 278,888
Cost of sales: |  |  |
Cost of sales | 203,419 | 140,596 | 149,714
Gross margin: |  |  |
Total gross margin | 149,643 | 100,087 | 129,174
Contract services |  |  |
Revenue: |  |  |
Revenue | 187,474 | 205,049 | 116,024
Cost of sales: |  |  |
Cost of sales | 163,603 | 163,900 | 80,640
Gross margin: |  |  |
Total gross margin | $ 23,871 | $ 41,149 | $ 35,384

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