Suppose that a metamorphic virus, DoomShift, is 99% useless bytes and 1% useful bytes. Unfortunately, DoomShift has infected the login program on your Unix system and increased its size from 54K bytes to 1,054K bytes; hence, 1,000K bytes of the login program now consists of the DoomShift virus. Barb has a cleanup program, DoomSweep, that is able to prune away the useless bytes of the DoomShift virus, so that in any infected file it will consist of 98% useless bytes and 2% useful bytes.
If you apply DoomSweep to the infected login program, what will be its new size?
If the DoomShift virus is 99% useless bytes, then it has 990K useless bytes and 10K useful ones. If you reduce the amount of useless bytes so that this 10K is now 2% of the total, then the total must be 500K. Thus, after running DoomSweep, the size of the login program will be 554K bytes.
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