Kate Spade

I asked the price on something that was on sale 70% plus an extra 20%.
The sales lady told me...it's 70% plus and extra 20%. I said..I know. I'd like to know the final cost. She said...you'll have to figure it out on your phone or if you have a QR reader you can use that.
So I spent the next 30 minutes figuring out what the prices were since there were no conversion charts anywhere.
I purchased something then left. I realized about 10 minutes later that it was the wrong item so I went and exchanged it for another item.
While I was doing that, a person who spoke little English asked for the price of something and the same lady told her the same thing she had told me earlier...70% plus 20%.
The poor lady looked puzzled and left the store.
My questions:
Why can't you have price conversion charts in the store?
Why can't the sales people give prices when asked?
Thank you
Lynnette Walker
269.501.1422