Suppose that a disk i/o takes 100 msec. let b(r) = 100, so the disk i/o’s for computing σc(r) on a uniprocessor machine will take about 10 seconds. what is the approximate speedup if this selection is executed on a parallel machine with p page 3 of 3 processors, where (a) p = 8 (b) p = 100 (c) p =1000 (2 pts)?