Thanks all for the replies.
Looks like it is 200% multiplied by the distance, my booking class is C.
I got the 7742 figure directly from the SQ booking page. As the ticket is in business class SIA give 125% of the miles flown (6193 as others have stated). They then provide another 25% of the base miles for being Krisflyer gold So in effect 150%.
I have hardly almost no points in my Krisflyer account, so adding this trip to it leaves me with a small pot I can do little with. MY Eurobonus account however is sat growing due to already making Diamond last month.
thanks again all!