task	execution time (seconds)
A	50
B	10
C	60
D	40

a) Table 1 gives the executation times for the tasks that make up a process. If we can make task C three times as fast, by what percent have we reduced the overall execution time of the process?

b) With regard to the execution times in table 1, if we can choose between making task C twice as fast or task D four times as fast, which will give us the most improvement in performance. That is, which will result in the smallest overall execution time of the process?

c) With regard to the execution times in table 1, is it possible to make task D fast enough to make the overall execution time 1.25 times as fast? If so, what will be the new execution time for task D?