HP 20b Consultant Financial, 30b Professional manual Mathematical Calculations

In RPN mode, the %key calculates x % of the number on Level 2 of the stack, when x is the number on Level 1 of the stack. It does not modify the number on Level 2 of the stack, and

thus allows you to perform addition or subtraction after pressing %to add or subtract x % from the number.

For example, 200I25%returns 50, but 200 is still on Level 2 of the stack, and pressing -returns 150, or 200-25%.

26 Mathematical Calculations