A computer can do mathematical operations move and copy documents at a speed in the order of million or billion instructions per second.
Computer output is generally very reliable subject to the conditions that the input data is correct and the program instructions should be reliable and correct.
( Garbage In Garbage Out- GIGO )
As various computer media can store millions of characters of data in a condensed form, there is a tremendous saving in the storage area required to maintain the vital records necessary in a business environment.
Computers are very accurate. They can perform their millions of operations with great accuracy as their circuits have no mechanical parts to wear and malfunction.