A program has a total of 10 million instructions. The instructions are divided into 3 classes .

   A program has a total of 10 million instructions. The instructions are divided into 3

     classes . The CPI and the frequency of occurrence of each class is as given below

                             Class          CPI       Frequency

                               A                1              50%

                               B                3              30%

                               C                5              20%

     What should be the minimum clock frequency to execute the program in no more

     than 20 milliseconds?   

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