Here is another textbook example which demonstrates the problem. You need to specify how many digits of accuracy you need for the comparison, and round your floats off accordingly.
my ( $number, $premium, $expected );
$number = 1.80;
$premium = $number * ( 1 + 10/100 ); # 1.8 + 10% of 1.8
$expected = 1.98; # As we know 1.8 + 10% of 1.8 is 1.98
printf "Number 1 : %20.19f\n", $premium ;
printf "Number 2 : %20.19f\n", $expected ;
print "Not" if ( $expected != $premium );
print "Equal !! ";
Number 1 : 1.9800000000000002043
Number 2 : 1.9799999999999999822
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