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(10 points) A program running on a CPU with a 2ns cycle time executes 10 billion (10E9) instructions. Half the instructions have an average CPI

(10 points) A program running on a CPU with a 2ns cycle time executes 10 billion (10E9) instructions. Half the instructions have an average CPI of 1, 30% of the instructions have an average CPI of 2, and the rest have an average CPI of 3. If a recompilation were to cause every 3-CPI instruction to be replaced with two 1-CPI instructions, what is the speedup (1.e., the ratio of the old execution time to the new execution time)

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