1.13 [15/10] Assume that we make an enhancement to a computer that improves some mode of execution by a factor of 10. Enhanced mode is used 50% of the time, measured as a percentage of the execution time when the enhanced mode is in use. Recall that Amdahl's Law depends on the fraction of the original, unenhanced exe- cution time that could make use of enhanced mode. Thus we cannot directly use this 50% measurement to compute speedup with Amdahl's Law. a. [15] What is the speedup we have obtained from fast mode? b. [10] What percentage of the original execution time has been converted to fast mode