What's a 20% Tip on a $90 Bill?

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Bill
$
Tip
%
Split? ways
Bill: $90.00
Tip: $18.00
Total: $108.00
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 $90.00 = 18.00 20% tip on $90.25 = 18.05 20% tip on $90.50 = 18.10 20% tip on $90.75 = 18.15
20% tip on $90.01 = 18.00 20% tip on $90.26 = 18.05 20% tip on $90.51 = 18.10 20% tip on $90.76 = 18.15
20% tip on $90.02 = 18.00 20% tip on $90.27 = 18.05 20% tip on $90.52 = 18.10 20% tip on $90.77 = 18.15
20% tip on $90.03 = 18.01 20% tip on $90.28 = 18.06 20% tip on $90.53 = 18.11 20% tip on $90.78 = 18.16
20% tip on $90.04 = 18.01 20% tip on $90.29 = 18.06 20% tip on $90.54 = 18.11 20% tip on $90.79 = 18.16
20% tip on $90.05 = 18.01 20% tip on $90.30 = 18.06 20% tip on $90.55 = 18.11 20% tip on $90.80 = 18.16
20% tip on $90.06 = 18.01 20% tip on $90.31 = 18.06 20% tip on $90.56 = 18.11 20% tip on $90.81 = 18.16
20% tip on $90.07 = 18.01 20% tip on $90.32 = 18.06 20% tip on $90.57 = 18.11 20% tip on $90.82 = 18.16
20% tip on $90.08 = 18.02 20% tip on $90.33 = 18.07 20% tip on $90.58 = 18.12 20% tip on $90.83 = 18.17
20% tip on $90.09 = 18.02 20% tip on $90.34 = 18.07 20% tip on $90.59 = 18.12 20% tip on $90.84 = 18.17
20% tip on $90.10 = 18.02 20% tip on $90.35 = 18.07 20% tip on $90.60 = 18.12 20% tip on $90.85 = 18.17
20% tip on $90.11 = 18.02 20% tip on $90.36 = 18.07 20% tip on $90.61 = 18.12 20% tip on $90.86 = 18.17
20% tip on $90.12 = 18.02 20% tip on $90.37 = 18.07 20% tip on $90.62 = 18.12 20% tip on $90.87 = 18.17
20% tip on $90.13 = 18.03 20% tip on $90.38 = 18.08 20% tip on $90.63 = 18.13 20% tip on $90.88 = 18.18
20% tip on $90.14 = 18.03 20% tip on $90.39 = 18.08 20% tip on $90.64 = 18.13 20% tip on $90.89 = 18.18
20% tip on $90.15 = 18.03 20% tip on $90.40 = 18.08 20% tip on $90.65 = 18.13 20% tip on $90.90 = 18.18
20% tip on $90.16 = 18.03 20% tip on $90.41 = 18.08 20% tip on $90.66 = 18.13 20% tip on $90.91 = 18.18
20% tip on $90.17 = 18.03 20% tip on $90.42 = 18.08 20% tip on $90.67 = 18.13 20% tip on $90.92 = 18.18
20% tip on $90.18 = 18.04 20% tip on $90.43 = 18.09 20% tip on $90.68 = 18.14 20% tip on $90.93 = 18.19
20% tip on $90.19 = 18.04 20% tip on $90.44 = 18.09 20% tip on $90.69 = 18.14 20% tip on $90.94 = 18.19
20% tip on $90.20 = 18.04 20% tip on $90.45 = 18.09 20% tip on $90.70 = 18.14 20% tip on $90.95 = 18.19
20% tip on $90.21 = 18.04 20% tip on $90.46 = 18.09 20% tip on $90.71 = 18.14 20% tip on $90.96 = 18.19
20% tip on $90.22 = 18.04 20% tip on $90.47 = 18.09 20% tip on $90.72 = 18.14 20% tip on $90.97 = 18.19
20% tip on $90.23 = 18.05 20% tip on $90.48 = 18.10 20% tip on $90.73 = 18.15 20% tip on $90.98 = 18.20
20% tip on $90.24 = 18.05 20% tip on $90.49 = 18.10 20% tip on $90.74 = 18.15 20% tip on $90.99 = 18.20