Question

Using mental math, the approximate tip to leave for a bill of $81.79, if you tip 15% would be _____..a.$8.20b.$10.30c.$12.30d.$16.40.

Answer 1

Answer:

Using mental math, the approximate tip to leave for a bill of $81.79, if you tip 15% would be?

c.$12.30

Step-by-step explanation:

10% is $8.179, then 5% is a half of this sum, i.e. $8.179:2=$4.0895

3. 15%=10%+5% and in $ it is $8.179+$4.0895=$12.2685 that is nearly $12.30.