Suppose the daytime processing load consists of $55\%$ CPU activity and $45\%$ disk activity. Your customers are complaining that the system is slow. After doing some research, you have learned that you can upgrade your disks for $$8,000$ to make them $2\mathrm{.}5$ times as fast as they are currently. You have also learned that you can upgrade your CPU to make it $1\mathrm{.}4$ as fast for $$5,000.$ Which would you choose to yield the best performance improvement for the least amount of money?