HP 12c financial calculator Manuale Utente

File name: hp 12c_user's guide_English_HDPMBF12E44 

Page: 27 of 209   

Printered Date: 2005/7/29   

Dimension: 14.8 cm x 21 cm 

 

A net amount — that is, the base amount plus or minus the percentage amount — 
can be calculated easily with your hp 12c, since the calculator holds the base 
amount inside after you calculate a percentage amount. To calculate a net amount, 
simply calculate the percentage amount, then press = or -. 

Example: You’re buying a new car that lists for $13,250. The dealer offers you 
a discount of 8%, and the sales tax is 6%. Find the amount the dealer is charging 
you, then find the total cost to you, including tax. 

13250\ 

13,250.00 Keys in the base amount and 

separates it from the percentage. 

8b 

1,060.00  Amount of discount. 

- 

12,190.00 Base amount less discount. 

6b 

Amount of tax (on $12,190). 

= 

12,921.40 Total cost: base amount less discount 

plus tax. 

To find the percent difference between two numbers: 

1.  Key in the base number. 
2. Press \ to separate the other number from the base number. 
3.  Key in the other number. 
4. Press à. 

If the other number is greater than the base number, the percent difference will be 
positive. If the other number is less than the base number, the percent difference 
will be negative. Therefore, a positive answer indicates an increase, while a 
negative answer indicates a decrease.   

If you are calculating a percent difference over time, the base number is typically 
the amount occurring first. 

Example: Yesterday your stock fell from 58

1

/

2

 to 53

1

/

4

 per share. What is the 

percent change? 

58.5\ 

Keys in the base number and 
separates it from the other number. 

53.25 

Keys in the other number. 

à 

Nearly a 9% decrease.