This is an optimization calculus problem where you would need to know a little bit more about the box, atleast i would think. You would just need to use the volume equation of a sphere as the restrictive equation in the optimization problem. Perhaps there is a way to solve with the given information, but i do not know how to.
M(CE) = 78 + 78*4/26 = 90
It is 50 thousands because 5 times 10 = 50.
I think it 4194304 i THINK thats the answer