Consider three diff erent processors P$1,$ P$2,$ and P$3$ executing

the same instruction set. P$1$ has a $3$ GHz clock rate and a CPI of $1\mathrm{.}5.$ P$2$ has a

$2\mathrm{.}5$ GHz clock rate and a CPI of $1\mathrm{.}0.$ P$3$ has a $4\mathrm{.}0$ GHz clock rate and has a CPI

of $2\mathrm{.}2.$