No of block for
supplier 2000/25=80
parts 4500/30=150
catalog 9000/45=200
Now question is "supplier who supply for every part"
if each supplier supply for every part ans will be 80*150=1200
but catalog table contains only 200 tuples
If 1 supplier supply for every 150 parts then already 150 block access will be there
So, ans 150 block access