Problem 3. [20 points] (P&H ARM Edition) Exercise 2.42 Assume that for a given program 70% of the executed instructions are arithmetic, 10% are load/store, and 20% are branch. 2.42.1 Given this instruction mix and the assumption that an arithmetic instruction requires two cycles, a load/store instruction takes six cycles, and a branch instruction takes three cycles, find the average CPI 2.42.2 For a 25% improvement in performance, how many cycles, on average, may an arithmetic instruction take if load/store and branch instructions are not improved at all? 2.42.3 For a 50% improvement in performance, how many cycles, on average, may an arithmetic instruction take if load/store and branch instructions are not improved at all