What's a 30% Tip on a $13 Bill?

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Bill
$
Tip
%
Split? ways
Bill: $13.00
Tip: $3.90
Total: $16.90
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 30 percent tip by bill amount? What should I tip if I want to leave 30? What's the total?
30% tip on $13.00 = 3.90 30% tip on $13.25 = 3.98 30% tip on $13.50 = 4.05 30% tip on $13.75 = 4.13
30% tip on $13.01 = 3.90 30% tip on $13.26 = 3.98 30% tip on $13.51 = 4.05 30% tip on $13.76 = 4.13
30% tip on $13.02 = 3.91 30% tip on $13.27 = 3.98 30% tip on $13.52 = 4.06 30% tip on $13.77 = 4.13
30% tip on $13.03 = 3.91 30% tip on $13.28 = 3.98 30% tip on $13.53 = 4.06 30% tip on $13.78 = 4.13
30% tip on $13.04 = 3.91 30% tip on $13.29 = 3.99 30% tip on $13.54 = 4.06 30% tip on $13.79 = 4.14
30% tip on $13.05 = 3.92 30% tip on $13.30 = 3.99 30% tip on $13.55 = 4.07 30% tip on $13.80 = 4.14
30% tip on $13.06 = 3.92 30% tip on $13.31 = 3.99 30% tip on $13.56 = 4.07 30% tip on $13.81 = 4.14
30% tip on $13.07 = 3.92 30% tip on $13.32 = 4.00 30% tip on $13.57 = 4.07 30% tip on $13.82 = 4.15
30% tip on $13.08 = 3.92 30% tip on $13.33 = 4.00 30% tip on $13.58 = 4.07 30% tip on $13.83 = 4.15
30% tip on $13.09 = 3.93 30% tip on $13.34 = 4.00 30% tip on $13.59 = 4.08 30% tip on $13.84 = 4.15
30% tip on $13.10 = 3.93 30% tip on $13.35 = 4.01 30% tip on $13.60 = 4.08 30% tip on $13.85 = 4.16
30% tip on $13.11 = 3.93 30% tip on $13.36 = 4.01 30% tip on $13.61 = 4.08 30% tip on $13.86 = 4.16
30% tip on $13.12 = 3.94 30% tip on $13.37 = 4.01 30% tip on $13.62 = 4.09 30% tip on $13.87 = 4.16
30% tip on $13.13 = 3.94 30% tip on $13.38 = 4.01 30% tip on $13.63 = 4.09 30% tip on $13.88 = 4.16
30% tip on $13.14 = 3.94 30% tip on $13.39 = 4.02 30% tip on $13.64 = 4.09 30% tip on $13.89 = 4.17
30% tip on $13.15 = 3.95 30% tip on $13.40 = 4.02 30% tip on $13.65 = 4.10 30% tip on $13.90 = 4.17
30% tip on $13.16 = 3.95 30% tip on $13.41 = 4.02 30% tip on $13.66 = 4.10 30% tip on $13.91 = 4.17
30% tip on $13.17 = 3.95 30% tip on $13.42 = 4.03 30% tip on $13.67 = 4.10 30% tip on $13.92 = 4.18
30% tip on $13.18 = 3.95 30% tip on $13.43 = 4.03 30% tip on $13.68 = 4.10 30% tip on $13.93 = 4.18
30% tip on $13.19 = 3.96 30% tip on $13.44 = 4.03 30% tip on $13.69 = 4.11 30% tip on $13.94 = 4.18
30% tip on $13.20 = 3.96 30% tip on $13.45 = 4.04 30% tip on $13.70 = 4.11 30% tip on $13.95 = 4.19
30% tip on $13.21 = 3.96 30% tip on $13.46 = 4.04 30% tip on $13.71 = 4.11 30% tip on $13.96 = 4.19
30% tip on $13.22 = 3.97 30% tip on $13.47 = 4.04 30% tip on $13.72 = 4.12 30% tip on $13.97 = 4.19
30% tip on $13.23 = 3.97 30% tip on $13.48 = 4.04 30% tip on $13.73 = 4.12 30% tip on $13.98 = 4.19
30% tip on $13.24 = 3.97 30% tip on $13.49 = 4.05 30% tip on $13.74 = 4.12 30% tip on $13.99 = 4.20