If you set it up in cross multiplication then you would have (x/100 = 45/54) then cross multiply so then i would look like this (54x/4,500) so from there you would divide 54 from 4,500 i hope this helps in any way oh and it should come up to be 83.3333333 which would be 83% lol
U could answer that question by adding 2.45+1.9=4.35
1,000 cubic feet because the pyramid is 4000 cubic feet on an area base of 40.