Did I tip the maid enough?

I hired a company with two gals to clean my house that I'm renting out. They spent 5.5hrs on it and omg it looked like a new house! I guess the cleaning company charged me like $450 to do it and it was a wreck because my puppy destroyed it so I gave each girl $ 50.00 each as a tip. I guess you're supposed to give 20% but im not giving them $90 each that's ridiculous.

Did I tip the maid enough?
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