What Percentage Off Would You Expect to Discount For Open Box Amp with Blemish

The amp is also a discontinued model which I believe should be further discounted.  So how much off  on a $3200 amp is the question? I called the dealer with a few questions. I asked if the amp would be on sale for Memorial Day since it’s a discontinued model. The girl said they didn’t do many sales on this brand (I know they do) Anyway,  she looked and found an open box in warehouse. She knocked 12% off MSRP. Does that sound right? Or should there be more discount due to blemish?  I think the later. I’ve always thought 10-12% off to be the norm discount on prime products.I know this isn't set in stone. But what is "normal" ? Whats your thought? Thanks for your input
$2,000 would be a reasonable price. Make them an offer!
35-40% off to see any of my Benjamin’s.
If it’s a usually easy selling product you would be lucky to get it much above 20% off. Depends on the blem too. 
Instead of asking what's an appropriate discount, ask yourself what you would be willing to pay and make an offer.  IME, dealers react more favorably to an offer to purchase.