Given:
Each cabinet has 5 drawers.
Each drawer can hold records for 50 clients.
Now,
Each cabinet can hold records for (50 × 5) clients
= 250 clients
Now,
Using unitary method,
250 clients records can be held up in 1 file cabinet.
1 client records can be held up in (1 / 250) file cabinet
600 client records can be held up in (1 / 250) × 600 file cabinet
= 2.4
So, we need 3 file cabinets...cause we cant't get 2.4 file cabinet