May I know the solutions and answers for part 1 B) Thank you

Prior to the early 1980s, machines were built with more and more complex instruction set. Why has there been a move to reduced instruction set computing (RISC) machines away from complex 1. instruction machines (CISC)? [5 marks] b. Consider three different processors P1, P2 and P3 executing the same instruction set. P1 has a 3 GHz clock rate and CPI of 1.5. P2 has a 2.5 GHz clock rate and a CPI of 1.0. P3 has a 4.0 GHz clock rate and has a CPI of 2.2 i. Which processor has the highest performance expressed in [5 marks] ii. If the processors each execute a program in 10 seconds, find 15 marks] iii. We are trying to reduce the execution time by 30% but this leads instructions per second? the number of cycles and the number of instructions to an increase of 20% in the CPI. What clock rate should we have to get this time reduction? [5 marks