Question: We have a processor ( CPU ) with clock rate of 1 GHz . When this processor polls an I / O device, each poling

We have a processor (CPU) with clock rate of 1 GHz. When this processor polls an I/O device, each poling action takes 500 clock cycles. The CPU is polling the hard drive, which sends data 4 bytes at a time at a rate of 2 MB/s. What fraction of the CPUs time is spent polling the hard drive?
Answer in scientific notation, with 4 significant digits:

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