<prompt> Translate the following text to SwahiliFurthermore, the source of the invested balances is predominantly revenue earned from the sales of services, for which they incurred costs of operations when the revenue was earned.  <response>: Kwa kuongezea, chanzo cha mabaki ya uwekezaji ni mapato yaliyopatikana kutoka kwa mauzo ya huduma, ambayo walipata gharama za shughuli wakati mapato yalipokelewa. 