6. Assume that multiply instructions take 5 cycles to execute and account for 30% of the instructions in a typical program and that the other 70% of the instructions require an average of 3 cycles for each instruction. a. What is the percentage of time that the CPU spends doing multiplication? [5%] Estimate the CPI value for a typical program executing on this machine [5%]. b. c. Assume that it is possible to reduce the number of cycles required for multiplication from 5 to 4, but this will require a 20% increase in the cycle time. Nothing else will be affected. Should we proceed with this modification? Explain why or why not [10%].