Computer Architecture

Consider two processors P1 and P2 of the same instruction set architecture. The instructions can be divided into four classes according to their CPI (class A, B, C, and D). And, their clock rate and CPI are like below: Assume that a program has total of 10^6 instructions, which are divided into classes as follows: 20% of A instructions, 10% B. 30% C. and 40% D. a. What is the average CPI of each processor? b Which processor is faster in the total execution time by how much