Suppose that a computer program takes 100 seconds of execution time on a computer with multiplication operation responsible for 80 seconds of this time. How much do you have to improve the speed of multiplication operation if you are asked to execute this program four times faster?
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Correct answer: C. 16 times faster
Explanation
To run in 25 s, the 20 s of non-multiply time stays, so multiplication must take 5 s instead of 80 s: 16 times faster.
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