error in multiplication in ruby 1.9.2 && 1.9.3dev

1.9.x bug in calculation

1.9.3dev

$ ruby -v
ruby 1.9.3dev (2010-12-08 trunk 30125) [i686-linux]

$ irb
ruby-head > 125.33 - (125.33/100.0*50.0)
 => 62.66499999999999
ruby-head > 125.33 / 100.0 * 50.0
 => 62.665000000000006
ruby-head > 15.33 / 100.0 * 50.0
 => 7.664999999999999 
ruby-head > (15.33 / 100.0) * 50.0
 => 7.664999999999999
ruby-head > (14.33 / 100.0) * 50.0
 => 7.165000000000001

1.9.2

$ ruby -v
ruby 1.9.2dev (2009-07-18 trunk 24186) [i686-linux]
$ irb
ruby-1.9.2-preview1 > (14.33 / 100.0) * 50.0
 => 7.165000000000001

1.8.7

$ ruby -v
ruby 1.8.7 (2010-04-19 patchlevel 253) [i686-linux], MBARI 0x8770, Ruby Enterprise Edition 2010.02
$ irb
irb(main):001:0> (14.33 / 100.0) * 50.0
=> 7.165