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Other income and other net gains/(losses) (Tables)
 12 Months Ended
Dec. 31, 2022
Other income and other net gain/(losses)  
Schedule of other income and other net gains/(losses)
    
2022
    
2021
    
2020
 
     $      $      $  
Government subsidies (note)
      534,678        7,932        513,860  
Bank interest income
      472,189        3,980        8,043  
Dividend income
      9,862        —          —    
Net foreign exchange (losses)/gain
s
      (688,725 )       285,025        (280,360 ) 
Impairment loss on interest in a joint venture
      —          —          (570,704 ) 
Impairment loss on amount due from a joint venture
      —          (176,227 )       —    
Sundry income
      76,639        18,238        13,757  
 
 
 
 
 
 
 
 
 
 
 
 
 
       404,643        138,948        (315,404 )