What's a 20% Tip on a $91 Bill?

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Bill
$
Tip
%
Split? ways
Bill: $91.00
Tip: $18.20
Total: $109.20
North American Tipping Guide
Restaurant
15-20% of the bill, including drinks.
Taxi
10% unless their credit card machine is "broken", then no tip.
Uber
It is now possible to tip using the app. Most people don't tip, so a small tip would be very appreciated.
Hair Salon
15-20%
Pizza
A few dollars
Room Service
A few dollars
Hotel Maid
$2 per day, or more if your room is messy. These are some of the lowest-paid employees, so tipping is a very nice gesture.
Tour Guide
If you really enjoyed the tour, then tip 5 or 10 dollars for your entire party.
How much? What is a 20 percent tip by bill amount? What should I tip if I want to leave 20? What's the total?
20% tip on $91.00 = 18.20 20% tip on $91.25 = 18.25 20% tip on $91.50 = 18.30 20% tip on $91.75 = 18.35
20% tip on $91.01 = 18.20 20% tip on $91.26 = 18.25 20% tip on $91.51 = 18.30 20% tip on $91.76 = 18.35
20% tip on $91.02 = 18.20 20% tip on $91.27 = 18.25 20% tip on $91.52 = 18.30 20% tip on $91.77 = 18.35
20% tip on $91.03 = 18.21 20% tip on $91.28 = 18.26 20% tip on $91.53 = 18.31 20% tip on $91.78 = 18.36
20% tip on $91.04 = 18.21 20% tip on $91.29 = 18.26 20% tip on $91.54 = 18.31 20% tip on $91.79 = 18.36
20% tip on $91.05 = 18.21 20% tip on $91.30 = 18.26 20% tip on $91.55 = 18.31 20% tip on $91.80 = 18.36
20% tip on $91.06 = 18.21 20% tip on $91.31 = 18.26 20% tip on $91.56 = 18.31 20% tip on $91.81 = 18.36
20% tip on $91.07 = 18.21 20% tip on $91.32 = 18.26 20% tip on $91.57 = 18.31 20% tip on $91.82 = 18.36
20% tip on $91.08 = 18.22 20% tip on $91.33 = 18.27 20% tip on $91.58 = 18.32 20% tip on $91.83 = 18.37
20% tip on $91.09 = 18.22 20% tip on $91.34 = 18.27 20% tip on $91.59 = 18.32 20% tip on $91.84 = 18.37
20% tip on $91.10 = 18.22 20% tip on $91.35 = 18.27 20% tip on $91.60 = 18.32 20% tip on $91.85 = 18.37
20% tip on $91.11 = 18.22 20% tip on $91.36 = 18.27 20% tip on $91.61 = 18.32 20% tip on $91.86 = 18.37
20% tip on $91.12 = 18.22 20% tip on $91.37 = 18.27 20% tip on $91.62 = 18.32 20% tip on $91.87 = 18.37
20% tip on $91.13 = 18.23 20% tip on $91.38 = 18.28 20% tip on $91.63 = 18.33 20% tip on $91.88 = 18.38
20% tip on $91.14 = 18.23 20% tip on $91.39 = 18.28 20% tip on $91.64 = 18.33 20% tip on $91.89 = 18.38
20% tip on $91.15 = 18.23 20% tip on $91.40 = 18.28 20% tip on $91.65 = 18.33 20% tip on $91.90 = 18.38
20% tip on $91.16 = 18.23 20% tip on $91.41 = 18.28 20% tip on $91.66 = 18.33 20% tip on $91.91 = 18.38
20% tip on $91.17 = 18.23 20% tip on $91.42 = 18.28 20% tip on $91.67 = 18.33 20% tip on $91.92 = 18.38
20% tip on $91.18 = 18.24 20% tip on $91.43 = 18.29 20% tip on $91.68 = 18.34 20% tip on $91.93 = 18.39
20% tip on $91.19 = 18.24 20% tip on $91.44 = 18.29 20% tip on $91.69 = 18.34 20% tip on $91.94 = 18.39
20% tip on $91.20 = 18.24 20% tip on $91.45 = 18.29 20% tip on $91.70 = 18.34 20% tip on $91.95 = 18.39
20% tip on $91.21 = 18.24 20% tip on $91.46 = 18.29 20% tip on $91.71 = 18.34 20% tip on $91.96 = 18.39
20% tip on $91.22 = 18.24 20% tip on $91.47 = 18.29 20% tip on $91.72 = 18.34 20% tip on $91.97 = 18.39
20% tip on $91.23 = 18.25 20% tip on $91.48 = 18.30 20% tip on $91.73 = 18.35 20% tip on $91.98 = 18.40
20% tip on $91.24 = 18.25 20% tip on $91.49 = 18.30 20% tip on $91.74 = 18.35 20% tip on $91.99 = 18.40