Loads$/$stores $($MEM$)$ use the same memory port as instruction fetches $($IF$).$Given that

$30\%$ of all instructions are loads and stores. Assume CPIold is $1\mathrm{.}5$

$123456789$

i IF ID EX MEM WB a load

i$+1$ IF ID EX MEM WB

i$+2$ IF ID EX MEM WB

i$+3**$ IF ID EX MEM WB

i$+4$ IF ID EX MEM WB

How much faster could a new machine with two memory ports be$?$