18 / 100 = 0.18
$15 x 0.18 = 2.70
$15 + 2.70 = 17.70
Formula: Tip = $15 x (18 / 100) = 2.70
| Tip % | Tip Amount | Total |
|---|---|---|
| 15% | $2.25 | $17.25 |
| 18% | $2.70 | $17.70 |
| 20% | $3.00 | $18.00 |
| 22% | $3.30 | $18.30 |
| 25% | $3.75 | $18.75 |
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