Calculating theoretical speedup using Amdahl's Law

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Hi I just wanted to get some thoughts on my working out on this question.

Using Amdahl's law calculate the maximum theoretical speedup for a program comprised of 82% parallel code and 18% serial code running on 8 processing cores

My thoughts is that - only the parallel code gets sped up therefore the calculation would be:

1/(0.82/8)+(0.18/1)

Is this correct? If not - could someone explain where I went wrong

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