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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Revenues | $ 303,603,522 | $ 273,134,908 | $ 134,927,410
Costs and expenses |  |  |
Cost of revenues | (113,808,128) | (95,144,945) | (61,270,887)
Selling and marketing expenses | (49,939,683) | (42,404,862) | (21,701,852)
General and administrative expenses | (36,582,626) | (38,271,252) | (42,974,825)
Technology and product development expenses | (24,575,485) | (14,286,120) | (5,221,124)
Total costs and expenses | (224,905,922) | (190,107,179) | (131,168,688)
Operating income | 78,697,600 | 83,027,729 | 3,758,722
Interest income | 3,300,976 | 111,881 | 202,474
Government grants | 322,273 | 1,419,837 | 99,277
Investment income | 21,407 | 54,824 | 13,994
Impairment loss | (705,428) |  |
Income before income taxes | 81,636,828 | 84,614,271 | 4,074,467
Income tax expense | (2,598,983) | (2,019,911) | (861,081)
Net income | 79,037,845 | 82,594,360 | 3,213,386
Net loss attributable to non-controlling interests | 718,952 | 6,318 |
Accretion of redeemable convertible preferred shares |  |  | (1,577,026)
Dividends distributed to redeemable convertible preferred shareholders |  |  | (3,704,083)
Net income (loss) attributable to Yalla Group Limited's shareholders | $ 79,756,797 | $ 82,600,678 | $ (2,067,723)
Earnings (loss) per ordinary share |  |  |
-Basic | $ 0.52 | $ 0.56 | $ (0.02)
-Diluted | $ 0.45 | $ 0.46 | $ (0.02)
Weighted average number of shares outstanding used in computing earnings (loss) per ordinary share |  |  |
-Basic | 153,526,679 | 148,739,986 | 91,755,810
-Diluted | 176,639,558 | 179,899,466 | 91,755,810
Other comprehensive income (loss) |  |  |
Foreign currency translation adjustments, net of nil income taxes | $ (2,218,541) | $ 146,021 | $ 368,771
Unrealized holding gains on short-term investments, net of income taxes of US$3,498, US$541 and nil for the years ended December 31, 2020, 2021 and 2022, respectively |  | 1,622 | 10,496
Less: reclassification adjustment for gains on short-term investments realized in net income, net of income taxes of US$3,498, US$541 and nil for the years ended December 31, 2020, 2021 and 2022, respectively |  | (1,622) | (10,496)
Other comprehensive income (loss), net of income taxes | (2,218,541) | 146,021 | 368,771
Comprehensive income | 76,819,304 | 82,740,381 | 3,582,157
Less: comprehensive loss attributable to non-controlling interests | 716,372 | 6,318 |
Comprehensive income attributable to Yalla Group Limited's shareholders | $ 77,535,676 | $ 82,746,699 | $ 3,582,157

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