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Suppose the daytime processing load consists of $70\%$ CPU activity and $30\%$ disk activity. Your customers are complaining that the system is slow. After doing some research, you have learned that you can upgrade your disks and make them $3\mathrm{.}5$ times as fast as they are currently are. You have also learned that you can upgrade your CPU to make it $1\mathrm{.}4$ times faster than it currently is$.$ You have time to implement one upgrade. Which one do you choose and Why? by Amdahls law