What's a 20% Tip on a $21 Bill?

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Bill
$
Tip
%
Split? ways
Bill: $21.00
Tip: $4.20
Total: $25.20
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 $21.00 = 4.20 20% tip on $21.25 = 4.25 20% tip on $21.50 = 4.30 20% tip on $21.75 = 4.35
20% tip on $21.01 = 4.20 20% tip on $21.26 = 4.25 20% tip on $21.51 = 4.30 20% tip on $21.76 = 4.35
20% tip on $21.02 = 4.20 20% tip on $21.27 = 4.25 20% tip on $21.52 = 4.30 20% tip on $21.77 = 4.35
20% tip on $21.03 = 4.21 20% tip on $21.28 = 4.26 20% tip on $21.53 = 4.31 20% tip on $21.78 = 4.36
20% tip on $21.04 = 4.21 20% tip on $21.29 = 4.26 20% tip on $21.54 = 4.31 20% tip on $21.79 = 4.36
20% tip on $21.05 = 4.21 20% tip on $21.30 = 4.26 20% tip on $21.55 = 4.31 20% tip on $21.80 = 4.36
20% tip on $21.06 = 4.21 20% tip on $21.31 = 4.26 20% tip on $21.56 = 4.31 20% tip on $21.81 = 4.36
20% tip on $21.07 = 4.21 20% tip on $21.32 = 4.26 20% tip on $21.57 = 4.31 20% tip on $21.82 = 4.36
20% tip on $21.08 = 4.22 20% tip on $21.33 = 4.27 20% tip on $21.58 = 4.32 20% tip on $21.83 = 4.37
20% tip on $21.09 = 4.22 20% tip on $21.34 = 4.27 20% tip on $21.59 = 4.32 20% tip on $21.84 = 4.37
20% tip on $21.10 = 4.22 20% tip on $21.35 = 4.27 20% tip on $21.60 = 4.32 20% tip on $21.85 = 4.37
20% tip on $21.11 = 4.22 20% tip on $21.36 = 4.27 20% tip on $21.61 = 4.32 20% tip on $21.86 = 4.37
20% tip on $21.12 = 4.22 20% tip on $21.37 = 4.27 20% tip on $21.62 = 4.32 20% tip on $21.87 = 4.37
20% tip on $21.13 = 4.23 20% tip on $21.38 = 4.28 20% tip on $21.63 = 4.33 20% tip on $21.88 = 4.38
20% tip on $21.14 = 4.23 20% tip on $21.39 = 4.28 20% tip on $21.64 = 4.33 20% tip on $21.89 = 4.38
20% tip on $21.15 = 4.23 20% tip on $21.40 = 4.28 20% tip on $21.65 = 4.33 20% tip on $21.90 = 4.38
20% tip on $21.16 = 4.23 20% tip on $21.41 = 4.28 20% tip on $21.66 = 4.33 20% tip on $21.91 = 4.38
20% tip on $21.17 = 4.23 20% tip on $21.42 = 4.28 20% tip on $21.67 = 4.33 20% tip on $21.92 = 4.38
20% tip on $21.18 = 4.24 20% tip on $21.43 = 4.29 20% tip on $21.68 = 4.34 20% tip on $21.93 = 4.39
20% tip on $21.19 = 4.24 20% tip on $21.44 = 4.29 20% tip on $21.69 = 4.34 20% tip on $21.94 = 4.39
20% tip on $21.20 = 4.24 20% tip on $21.45 = 4.29 20% tip on $21.70 = 4.34 20% tip on $21.95 = 4.39
20% tip on $21.21 = 4.24 20% tip on $21.46 = 4.29 20% tip on $21.71 = 4.34 20% tip on $21.96 = 4.39
20% tip on $21.22 = 4.24 20% tip on $21.47 = 4.29 20% tip on $21.72 = 4.34 20% tip on $21.97 = 4.39
20% tip on $21.23 = 4.25 20% tip on $21.48 = 4.30 20% tip on $21.73 = 4.35 20% tip on $21.98 = 4.40
20% tip on $21.24 = 4.25 20% tip on $21.49 = 4.30 20% tip on $21.74 = 4.35 20% tip on $21.99 = 4.40