What's a 20% Tip on a $18 Bill?

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Bill
$
Tip
%
Split? ways
Bill: $18.00
Tip: $3.60
Total: $21.60
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 $18.00 = 3.60 20% tip on $18.25 = 3.65 20% tip on $18.50 = 3.70 20% tip on $18.75 = 3.75
20% tip on $18.01 = 3.60 20% tip on $18.26 = 3.65 20% tip on $18.51 = 3.70 20% tip on $18.76 = 3.75
20% tip on $18.02 = 3.60 20% tip on $18.27 = 3.65 20% tip on $18.52 = 3.70 20% tip on $18.77 = 3.75
20% tip on $18.03 = 3.61 20% tip on $18.28 = 3.66 20% tip on $18.53 = 3.71 20% tip on $18.78 = 3.76
20% tip on $18.04 = 3.61 20% tip on $18.29 = 3.66 20% tip on $18.54 = 3.71 20% tip on $18.79 = 3.76
20% tip on $18.05 = 3.61 20% tip on $18.30 = 3.66 20% tip on $18.55 = 3.71 20% tip on $18.80 = 3.76
20% tip on $18.06 = 3.61 20% tip on $18.31 = 3.66 20% tip on $18.56 = 3.71 20% tip on $18.81 = 3.76
20% tip on $18.07 = 3.61 20% tip on $18.32 = 3.66 20% tip on $18.57 = 3.71 20% tip on $18.82 = 3.76
20% tip on $18.08 = 3.62 20% tip on $18.33 = 3.67 20% tip on $18.58 = 3.72 20% tip on $18.83 = 3.77
20% tip on $18.09 = 3.62 20% tip on $18.34 = 3.67 20% tip on $18.59 = 3.72 20% tip on $18.84 = 3.77
20% tip on $18.10 = 3.62 20% tip on $18.35 = 3.67 20% tip on $18.60 = 3.72 20% tip on $18.85 = 3.77
20% tip on $18.11 = 3.62 20% tip on $18.36 = 3.67 20% tip on $18.61 = 3.72 20% tip on $18.86 = 3.77
20% tip on $18.12 = 3.62 20% tip on $18.37 = 3.67 20% tip on $18.62 = 3.72 20% tip on $18.87 = 3.77
20% tip on $18.13 = 3.63 20% tip on $18.38 = 3.68 20% tip on $18.63 = 3.73 20% tip on $18.88 = 3.78
20% tip on $18.14 = 3.63 20% tip on $18.39 = 3.68 20% tip on $18.64 = 3.73 20% tip on $18.89 = 3.78
20% tip on $18.15 = 3.63 20% tip on $18.40 = 3.68 20% tip on $18.65 = 3.73 20% tip on $18.90 = 3.78
20% tip on $18.16 = 3.63 20% tip on $18.41 = 3.68 20% tip on $18.66 = 3.73 20% tip on $18.91 = 3.78
20% tip on $18.17 = 3.63 20% tip on $18.42 = 3.68 20% tip on $18.67 = 3.73 20% tip on $18.92 = 3.78
20% tip on $18.18 = 3.64 20% tip on $18.43 = 3.69 20% tip on $18.68 = 3.74 20% tip on $18.93 = 3.79
20% tip on $18.19 = 3.64 20% tip on $18.44 = 3.69 20% tip on $18.69 = 3.74 20% tip on $18.94 = 3.79
20% tip on $18.20 = 3.64 20% tip on $18.45 = 3.69 20% tip on $18.70 = 3.74 20% tip on $18.95 = 3.79
20% tip on $18.21 = 3.64 20% tip on $18.46 = 3.69 20% tip on $18.71 = 3.74 20% tip on $18.96 = 3.79
20% tip on $18.22 = 3.64 20% tip on $18.47 = 3.69 20% tip on $18.72 = 3.74 20% tip on $18.97 = 3.79
20% tip on $18.23 = 3.65 20% tip on $18.48 = 3.70 20% tip on $18.73 = 3.75 20% tip on $18.98 = 3.80
20% tip on $18.24 = 3.65 20% tip on $18.49 = 3.70 20% tip on $18.74 = 3.75 20% tip on $18.99 = 3.80