4. The following two questions compare performance in different scenarios using different strategies. a) [2 pts] Consider a processor that supports a wide variety of instructions including arithmetic, logical, branches, load/store, etc. Designer can improve the performance of the arithmetic instructions by 10 times. Apply Amdhal's law to compute the overall performance (speedup) for a program consisting of 40% arithmetic instructions. Assume that the remaining 60% instructions are not affected by the above modification. Please show major steps in your computation (e.g., write the equation, plugin the values, compute the speedup, etc.). b) [4 pts] We are comparing the performance of two computers (A and B) while running the same program. Assume that both computers use the same instruction set architecture with the following characteristics. Which computer is faster for this program and by how much? Please show major steps in your computation (e.g., compute execution time, compute ratio, and explicitly state which computer is faster and by how much compared to the other one, etc.). Clock Frequency Cycles per Instruction (CPI) Computer A Computer B 500 MHz 2.0 GHz 1.0 5.0