Given: Suppose that we can improve the floating point instruction performance of machine by a factor of 15 (the same floating point instructions run 15 times faster on this new machine). Question: What percent of the instructions must be floating point to achieve a Speedup of at least 5? a) 75.00% b) 90,45% c) 80.36% d) 85.71% e) 65,43% ) 102.85.00%