I missed the original post:
Subject: [lace-chat] maths question from a non
mathematician
This has nothing to do with lace but I've seen this
question answered before - when I didn't need the info.
I have a magazine with patterns printed at 50% and 75%
of full size. What size do I need to set a photocopier
to get 100% of pattern size?
It's ninth-grade algebra: (If the word "algebra" gives you
brain-freeze, just read the part between dashed lines.)
Let P be the percent by which the pattern in the publication
has been enlarged or reduced.
Let C be the percent at which you need to set your copier.
Then P times C equals 100%: PC = 1
Divide both sides of the equation by P: C = 1/P
---------------------------------------------------------
That is, you need to set the copier for the inverse of the
change that you want to undo.
---------------------------------------------------------
You can punch "1 divide P equals" on your calculator, but if
the percentage happens to be a common fraction, you can just
turn it upside down.
50% is 1/2, so to undo it, you use 2, which is 200%.
(Remember that "per cent" means "divide by one hundred".)
75% is 3/4, so you would use 4/3, which is one and a third:
133.33%
--
Joy Beeson
http://wlweather.net/PAGEJOY/
west of Fort Wayne, Indiana, U.S.A.
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