please solve all those question as soon as possible

2.40 Assume that for a given program 70% of the executed instructions are arithmetic, 10% are load/store, and 20% are branch. 2.40.1 [5] 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. 2.40.2 [5] 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? 2.40.3 [5] 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