Problem $1$: $(6$ pts$,3$ pts each sub$-$part$)$

Consider two different implementation of the same instruction set architecture. The instruction can be divided

into four classes according to their CPI $($class A$,$ B$,$ C and D$).$ P$1$ with clock rate of $3GHz$ and CPIs of $1,4,3$

and $2,$ and P$2$ with a clock $2\mathrm{.}5$ GHz and CPIs of $2,3,2$ and $1.$

Given a program with a dynamic instruction count of $1\mathrm{.}0$E$6$ instructions divided into classes as follows: $20\%$

class A$,35\%$ class B$,20\%$ class C and $25\%$ class D$,$ which implementation is faster?

a$)$ What is the global CPI for each implementation?

b$)$ Find the clock cycle required in both cases.