How do I calculate response time of a multiple core cpu when given certain information?
I think you don't need to add (7*number of cores) to the total response time. The overall execution time requires just 7 more seconds, because each piece of code is running in parallel with others. So just divide 200 by the number of cores and add 7 to it. Obviously in the ideal case you don't need to add anything. Also look at the Amdahl's law in the Wikipedia... It also states a law about speedup with parallelism and these problems share the same concept.