Consider two different implementation of the same instruction set architecture. The instructions can be divided into four classes according to their CPI (class A, B, C, and D). P1 has a clock rate of 2.5 GHz and CPIs of 1 (class A), 2 (class B), 3 (class C), and 5 (class D).

Given a program with a dynamic instruction count of 25 million instructions divided into classes as follows: 15% class A, 50% class B, 25% class C, 10% class D:

a. What is the global CPI?

b. Find the clock cycles required to run the program on P1.