$(2$ points$)$ In a server, the processor accounts for $50\%$ of total server power, the memory

system accounts for $30\%,$ the disk accounts for $10\%,$ and miscellaneous components

account for the remaining $10\%.$ You have a $$500$ budget to upgrade your server to make

it more power$-$efficient. You plan to either replace your memory module with a new

memory module or your disk with a new disk. With that budget, you can either purchase

a new memory module that consumes $20\%$ less power than your old memory module, or

a new disk that consumes $40\%$ less power than your old disk. Which of the two will you

purchase if you were only concerned with reducing your server's power consumption?