>Hi,
> I have an order to purchase 20 sets of my application. It is my 1st time to deliver such big numbers of copy. How to charge for subsequent license of software copy?
>

There's no fixed discounting or licensing standard - you have to negotiate the price with the client. If selling to a dealer, realize he will want to make money on the resale of the software; if you price things too high, it may be worth his while to purchase a different package that he can make a profit selling.