$1\mathrm{.}6\mathrm{.}4$ Assume that peak performance is defined as the fastest rate that $1$ computer can execute any instruction sequence. What are the peak performances of $P1$ and $P2$ expressed in instructions per second?

$1\mathrm{.}6\mathrm{.}5[5]($:$1\mathrm{.}4$:$)$ If the number of instructions executed in a certain program is divided equally among the classes of instructions in Problem $2\mathrm{.}36\mathrm{.}4$ except for class A$,$ which occurs twice as often as each of the others, how much faster is P$2$ than P$1?$

what frequency does $P2$ have the same performance as $\frac{?}{PI}$ for the instruction mix given in $1\mathrm{.}6\mathrm{.}5?$