The monthly minimum wage for all foreign maids in Hong Kong, including obviously Filipinas, was raised on Sept 20 last year to 3920 Hong Kong Dollars per month.

If the employer does not provide food for the maid, then a food allowance of HK$875 is also applicable.

That's over $600 per month as far as I can tell. 1200 riyals works out to be about half that figure.