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C:\test>jimagezipcmp.pl
  adding: 1.png (160 bytes security) (deflated 90%)
...
  adding: 1.png (160 bytes security) (deflated 90%)
  adding: 2.png (160 bytes security) (deflated 89%)
1.0272952853598

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#! perl -slw
use strict;
...

print +( $size1 + $size2 ) / $size3;