How many payments of R1887, at the end of each 4-month period, must be made at a rate of 11.073% per year, compounded every 4 months, so as as to accumulate at least R28243?

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Hoeveel paaimente van R1887, aan die einde van elke 4-maand period, moet gemaak word teen 'n rentekoers van 11.073% per jaar, saamgestel elke 4 maande, om tot ten minste R28243 te akkumuleer?