If each box has 10 packs and each pack has 10 markers, then each box has 10 * 10 = 100 markers.
So we can buy 276 makers i.e. by buying 2 boxes, 7 packs and 6 markers or 1 box, 17 packs and 6 markers.
I'm not sure what kind of pictures do you mean but I hope it will eventually help you draw them :)