In a coin factory, a machine takes 2kg block of zinc. It then divides this into rectangles each weighing 8g. These rectangles
are then stamped into discs of zinc each weighing 5g with the
remaining zinc discarded.
These zinc discs are then stamped with collectable designs and
next packed into bags of 6 which are sealed and finally packed
into boxes, each containing 4 bags ready for delivery to various
coin collecting shops.
What percentage weight of zinc out of the original block will
be contained in all of the COMPLETELY FILLED boxes
combined? (i. e. those containing a full 4 bags)