2017 AMC 10A Problems/Problem 7

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Jerry and Silvia wanted to go from the southwest corner of a square field to the northeast corner. Jerry walked due east and then due north to reach the goal, but Silvia headed northeast and reached the goal walking in a straight line. Which of the following is closest to how much shorter Silvia's trip was, compared to Jerry's trip? (A) 30% (B) 40% (C) 50% (D) 60% (E) 70%