perl -e 'print ((.0425*2) + .0025 ) - ((.0425*2) + .0025 ); print $/;'

##</code><code>##

$ perl -we 'print ((.0425*2) + .0025 ) - ((.0425*2) + .0025 ); print $/;'
print (...) interpreted as function at -e line 1.
Useless use of subtraction (-) in void context at -e line 1.
0.0875

##</code><code>##

$ perl -we 'print (((.0425*2) + .0025 ) - ((.0425*2) + .0025 )); print $/;'
0

$ perl -we 'print +((.0425*2) + .0025 ) - ((.0425*2) + .0025 ); print $/;'
0