"tip's" leaped out at me too - was just going to bitch about it here. I understand the "tip is" contraction. But it still sounds weird, still sounds like a pl

"tip's" leaped out at me too - was just going to bitch about it here. I understand the "tip is" contraction. But it still sounds weird, still sounds like a plural. Un-contracted it would read "Just $29 per wash, tip is included". If that read "Just $29 per wash, THE tip is included" or "Just $29 per wash, THE tip's included" it wouldn't have made me cringe.