At a company a central computer is used in half of the working time in accountancy related to income, in 2/5 of the time in accountancy related to expenditure, and in the remaining time in accountancy related to taxes. The computer is idle in 15% of the time, if it is allocated to processing income; 9% of the time, if it is allocated to processing expenditure; and 18% of the time, if it is allocated to processing taxes. The probability that the computer is idle at a randomly chosen moment is 0.093 || 0.129|| 0.111| 0.054

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