Subtotal: $612.73. Suggested Gratuity: 18% GRATUITY $110.29, 20% GRATUITY $122.54, 22% GRATUITY $134.80. TIP: $9.00. TOTAL: $629.73. To everyone acting like tipping rules are written in stone, let's talk about it. I had a $612 dinner bill, and suddenly I'm