So to get exact results, do all your calculations in integers, and divide by 100 for display purposes.
Or, more transparently: use bignum - for example:
perl -Mbignum -e "print (100.10-100);"
gives the correct answer 0.1
s^^unp(;75N=&9I<V@`ack(u,^;s|\(.+\`|"$`$'\"$&\"\)"|ee;/m.+h/&&print$&
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