HP 50G, User Manual

Page: 142 / 887

Page 3-12
Option 19. MATH.. returns the user to the MTH menu. The remaining functions
are grouped into six different groups described below.
If system flag 117 is set to SOFT menus , the REAL functions menu will look like
this (ALG mode used, the same soft menu keys will be available in RPN mode):
The very last option,
)@@MTH@
, returns the user to the MTH menu.
Percentage functions
These functions are used to calculate percentages and related values as follows:
% (y,x) : calculates the x percentage of y
%CH(y,x) : calculates 100(y-x)/x, i.e., the percentage change, the
difference between two numbers.
%T(y,x) : calculates 100 x/y, i.e., the percentage total, the portion
that one number (x) is of another (y).
These functions require two arguments, we illustrate the calculation of
%T(15,45) , i.e., calculation 15% of 45, next. We assume that the calculator is
set to ALG mode, and that system flag 117 is set to CHOOSE boxes . The
procedure is as follows:
„´
Select MTH menu
5
@@OK@@
Select the 5. REAL.. menu
3
@@OK@@
Select the 5. %T function
15
Enter first argument
‚í
Enter a comma to separate arguments
45
Enter second argument
`
Calculate function