A program spends 75% of its time doing multiply instructions. If the multiplier is speed up by 3x, how much faster does the application run?
(A) 2x times faster
(B) 3x times faster
(C) 4x times faster
(D) None of these.


Answer: (A)

Explanation: 75% of the time is 3x faster, so that 75% now takes up 1/3 of that time, or only 25% of the original execution time. We have effectively eliminated 50% of the total execution time so the program is 2x faster.

So, option (A) is correct.


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