Question

Jose creates a scale drawing of a character from one of his comic books using a scale factor of 40%. Caroline wants to use Jose’s scale drawing to create the original-size image of the comic book character. What scale factor will Caroline need to use to draw the original-size image?

Answer 1

Going from the original to the drawing had a scale factor of 40%=0.4=4/10.  Reversing this process, going from the drawing back to the original, would use the reciprocal of this, or 10/4=2.5=250%.