Assume that the sequential part of an algorithm accounts for 20% of the programs computation time. Let Sn be the speedup on n processors, assuming that the rest of the program is perfectly parallelizable. Your boss tells you to double the speedup: the revised program should have speedup S^1 > 2S. You advertise for a programmer to replace thesequential part with an improved version that must run k times faster. What value of k should you require?