Walking eastwards a certain number of paces, followed by walking back westwards the same number of paces, is an example of two opposite effects that cancel out to give an overall zero change. Read the following:
(A) Adding and then subtracting the same number.
(B) Multiplying and then dividing by the same number.
(C) Increasing by 60% and then decreasing by 60%.
(D) Turning clockwise and then anticlockwise through the same angle.
(E) Climbing up and down a ladder by the same number of rungs.

Which of the above behave in the same way as the activity described in the opening sentence of this
question?