Question

PLEASE HELP
If a page is reduced to 80%, what percent enlargement would return to its original size ?

Answer 1

It's simple :)
what do you multiply to 0.8 so that you get 1?

Answer 2

you need more than 20%, because 20% of 100 is missing
it is not 20% of 80 that was reduced away

Answer 3

25%

Answer 4

How do I get 25%?

Answer 5

(100-80)/80 *100

Answer 6

@mrom
you want 100% from 80:

100/80 = 1,25

100 is 125% of 80, or increase of 25%

Answer 7

Can I use that same equation to figure out how many times I would have to photocopy a page to make the final result less than 5% of the original size ?

Answer 8

if you have 100, and take half of it then this is how it goes:
0 x 50%: 100
1 x 50% : 50
2 x 50% : 25
3 x 50% : 12.5

instead of making a table you can also do this in one step:
100 x (0.5)^3 = 100 x 0.125 = 12.5

Answer 9

% =change/starting point

Answer 10

20%

Answer 11

so to take the half of a half you
multiply the original size x half^2

Answer 12

and you can plug anything instead of half
you can put a fifth there:

a fifth of a fifth is: original * fifth^2