Misc mathematicians pls help (cell tech q)

My cell tech came in 10 x 1ml (250 mg/ml) ampoules.

I plan on taking 300mg a week split into 2 x weekly 150mg injections. How much do I need to load for each shot.

Also how do I go about doing this practically as obviously can't close an ampoule so I'll have to preload the next one with the remaining oil