Question 1

What are the 4 modes?

Accepted Answer

Calculate what percentage X is of Y, find what percent X is of Y, compute percentage increase/decrease, and calculate a percentage of a number.

Question 2

How do I calculate a tip?

Accepted Answer

Use "% of Number" mode: enter the tip percentage and the bill amount.

Question 3

How do I calculate profit margin?

Accepted Answer

Use "What %" mode: enter profit as the first number and revenue as the second.