It doesn't even know that the figure represents your pay cheque. Of course clever computer designers and programmers try to anticipate problems of computer failure and computer mistakes, but their efforts will always be severely hampered because the computer doesn't understand. But suppose I had accidently inserted the word 'not' in the previous sentence. Any human would see right away that I had made a mistake. But a computer does not have human understanding.
Man alone understands and therefore is able to discern failure and recognise mistakes.
God gave man such understanding. Since computers are machines that must be programmed, they have not only the limitations listed above, they also have all the limitations of the humans who program them. Man is finite, he makes mistakes and he is sinful. The computer is a tool in his hands. This tool, like all tools, may be used for good or for ill, for God's glory or to blaspheme, to advance God's kingdom or in an attempt to defy Him.