Had lunch at Luke's. Enjoyed a great salad topped with Wild Alaskan Salmon. Wife had a great fish sandwich. Service was very good as well. With the check I used a $12 off Enjoy Coupon Book coupon. When server returned with the adjusted check, he pointed out restaurant's policy when using Enjoy coupon was to automatically add an 18% gratuity to the subtotal before discount. Not only is that not stated on their coupon but when calculating the 18%, they do it not just on the subtotal before discount but they add on the 7% sales tax. Tipping norms are that you don't include the amount WITH tax, when calculating tip, but it's the amount WITHOUT tax.