Fun problem. Here is a solution in 72 characters with a bound of 1000:
sub largest {my$r;$r.='('.5x$_.')*'for@_;for($i=1000;;$i--){return$i if(5x$i)!~/^$r$/}}

-Mark

In reply to Re: Golf: Buying with exact change by kvale
in thread Golf: Buying with exact change by blokhead

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