8 fps makes me cry. I did like how you gave us an example that we could work out in our heads, and then went into a harder one, after we knew the formula and confirmed that it works.
I don't know if you can answer this question but I can't seem to find anyone that knows. Example: Lets say I drew a picture of a lady, head to toe. The size of the paper I drew it on is 6 x 8 (inches). I want to enlarge this on a copy machine to "8" x 10 (inches)...Copy machines allow you to enlarge by percentage. Is there a formula for enlarging, when I tried it, the width came out fine, but the length of the drawing was too long and chops off the bottom of the drawing when I put in in a picture frame with a 8x10 opening.