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my $num1 = 0.29;
my $num2 = 50;
my $num3 = $num1 * $num2;
print "num3=$num3\n"; # is '14.5'

my $num4 = sprintf ("%.64f", $num7);

my $num1 = 0.29;
my $num2 = sprintf ("%.64f", $num1);
...
num8=14.499999999999998223643160599749535322189331054687500000000...
num9=14.5
num10=14.50000000000000000000000000000000000000000000000000000000...