1.5000 -> $1.50
1.5050 -> $1.50
1.5051 -> $1.51

##</code><code>##

1.5100 -> $1.51
1.5150 -> $1.52

##</code><code>##

sub monetize {
 require Math::BigFloat;
 #Defaults to a real $USD amount, rounding to nearest penny
 Math::BigFloat->new($_[0])->ffround( $_[1] || -2 );
}