Final answer:
To get the original size, you should use a photocopy setting of 133%.
Step-by-step explanation:
To find the photocopy setting that will give the original size, we need to determine the percentage increase needed for the smaller version. Since the 75% setting creates a smaller version, we can divide 100 (the original size) by 75 (the smaller size) to find the percentage increase needed. So, 100 / 75 = 1.33 (rounded to two decimal places). This means that we need to increase the size by 33%, which corresponds to a photocopy setting of 133%.