Hi,
Thank you for reply.
My 1st copy of software is costed about US800 dollar. How should I charge for the following copy? It is my 1st time, therfore I also don't know to to mark the price. Do you think 10-20% discount is reasonable? It is too high or too low? I heard from somebody that, the following copies should be charged only about US100-200 dollar. Is it too low!!???

pls advice.

thank you