Suppose that 95% of the execution time in a certain program is due to code that can be split into N independent parts each of which can be executed...

Suppose that 95% of the execution time in a certain program is due to code that can be split into N independent parts each of which can be executed by a separate processor.  The remaining 5% is sequential and must execute on a single processor. If  T1 is the execution time for this program running on a single processor, what is the upper limit on the speedup provided for this program?  Assume that you can use as large an integer value as you choose for N (i.e. for the number of processors).