Answer:
The 15% tip is $3.90
Explanation:
To find 15% of $26, multiply .15 × 26
You get 3.9 that is $3.90. (If we aren't talking about dollars$, then sorry, but the numbers/math is the same)
If you're at the table and everyone's phone is dead (so no calculators), then find 10%:
10% of 26.00 is 2.60 (just move the decimal to the left one place)
Cut it in half to find 5%:
Half of 2.60 is 1.30
Add them together:
2.60 + 1.30 is 3.90
15% of 26 is 3.90