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Since the problem says the modification only affects the multiply instruction, then it can be assumed that IC and C remains the same in both situations. In order to find out N it is necessary to write the CPU_time for both situation.
CPU_time1=IC* CPI *C= 4*IC *C
CPU_time2=[N*IC/100 * CPI_multiply + (1- N/100) *IC*CPI_other]*C...
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