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with a four programs in memory and with 80% average I/O wait,the CPU utilization

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with a four programs in memory and with 80% average I/O wait,the CPU utilization

a)60%  b)70%  d)90%  d)100%

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The CPU utilization can be modeled by the formula:-
CPU utilization = 1 - p^n
Here n is number of process and P is the time waiting for I/O.
In your question n=4 and p =.80
so Utilization is 1-.8^4 which is   .6   (i.e. 60%)
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