What's a 20% Tip on a $15 Bill?

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Bill
$
Tip
%
Split? ways
Bill: $15.00
Tip: $3.00
Total: $18.00
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 $15.00 = 3.00 20% tip on $15.25 = 3.05 20% tip on $15.50 = 3.10 20% tip on $15.75 = 3.15
20% tip on $15.01 = 3.00 20% tip on $15.26 = 3.05 20% tip on $15.51 = 3.10 20% tip on $15.76 = 3.15
20% tip on $15.02 = 3.00 20% tip on $15.27 = 3.05 20% tip on $15.52 = 3.10 20% tip on $15.77 = 3.15
20% tip on $15.03 = 3.01 20% tip on $15.28 = 3.06 20% tip on $15.53 = 3.11 20% tip on $15.78 = 3.16
20% tip on $15.04 = 3.01 20% tip on $15.29 = 3.06 20% tip on $15.54 = 3.11 20% tip on $15.79 = 3.16
20% tip on $15.05 = 3.01 20% tip on $15.30 = 3.06 20% tip on $15.55 = 3.11 20% tip on $15.80 = 3.16
20% tip on $15.06 = 3.01 20% tip on $15.31 = 3.06 20% tip on $15.56 = 3.11 20% tip on $15.81 = 3.16
20% tip on $15.07 = 3.01 20% tip on $15.32 = 3.06 20% tip on $15.57 = 3.11 20% tip on $15.82 = 3.16
20% tip on $15.08 = 3.02 20% tip on $15.33 = 3.07 20% tip on $15.58 = 3.12 20% tip on $15.83 = 3.17
20% tip on $15.09 = 3.02 20% tip on $15.34 = 3.07 20% tip on $15.59 = 3.12 20% tip on $15.84 = 3.17
20% tip on $15.10 = 3.02 20% tip on $15.35 = 3.07 20% tip on $15.60 = 3.12 20% tip on $15.85 = 3.17
20% tip on $15.11 = 3.02 20% tip on $15.36 = 3.07 20% tip on $15.61 = 3.12 20% tip on $15.86 = 3.17
20% tip on $15.12 = 3.02 20% tip on $15.37 = 3.07 20% tip on $15.62 = 3.12 20% tip on $15.87 = 3.17
20% tip on $15.13 = 3.03 20% tip on $15.38 = 3.08 20% tip on $15.63 = 3.13 20% tip on $15.88 = 3.18
20% tip on $15.14 = 3.03 20% tip on $15.39 = 3.08 20% tip on $15.64 = 3.13 20% tip on $15.89 = 3.18
20% tip on $15.15 = 3.03 20% tip on $15.40 = 3.08 20% tip on $15.65 = 3.13 20% tip on $15.90 = 3.18
20% tip on $15.16 = 3.03 20% tip on $15.41 = 3.08 20% tip on $15.66 = 3.13 20% tip on $15.91 = 3.18
20% tip on $15.17 = 3.03 20% tip on $15.42 = 3.08 20% tip on $15.67 = 3.13 20% tip on $15.92 = 3.18
20% tip on $15.18 = 3.04 20% tip on $15.43 = 3.09 20% tip on $15.68 = 3.14 20% tip on $15.93 = 3.19
20% tip on $15.19 = 3.04 20% tip on $15.44 = 3.09 20% tip on $15.69 = 3.14 20% tip on $15.94 = 3.19
20% tip on $15.20 = 3.04 20% tip on $15.45 = 3.09 20% tip on $15.70 = 3.14 20% tip on $15.95 = 3.19
20% tip on $15.21 = 3.04 20% tip on $15.46 = 3.09 20% tip on $15.71 = 3.14 20% tip on $15.96 = 3.19
20% tip on $15.22 = 3.04 20% tip on $15.47 = 3.09 20% tip on $15.72 = 3.14 20% tip on $15.97 = 3.19
20% tip on $15.23 = 3.05 20% tip on $15.48 = 3.10 20% tip on $15.73 = 3.15 20% tip on $15.98 = 3.20
20% tip on $15.24 = 3.05 20% tip on $15.49 = 3.10 20% tip on $15.74 = 3.15 20% tip on $15.99 = 3.20