Percentage calculation problem

[Hans]

Hi,
I'm in need of some urgent assitance with percentage calculation.

I have a value 23.59 and need to increase it by 12% (.12 or 1.12)

I have a formula nvalue = ovalue*percentage.

so using it I get 26.42 =(23.59 +(23.59*.12)) or (23.59 * 1.12)

but if i do the same on a standard calculator 23.59 + 12 then press the %
button, I get 26.81

why the difference?, is the formula wrong or is the calculator wrong.

Whats the correct method to get the same answer as the calculator, if it is
correct using coding

Thanks in adance for any assistance.

 

[Jake]

The value you are getting using the formula is correct.

I can't explain what the calculator is doing.

Jacob

 

[Hans]

Hi Jake,

Thanks for the reassurance, but now my problem is to convince the customer
that what I have used is correct and that his calulator could be giving worng
information.

hans.

 

[Jim Burke in Novi]

Just tell him to type in 23.59 * 1.12 on his calculator, he'll see the right
answer. Then it's up to him to figure out why he isn't getting the right
answer with the other method. He either doesn't know how to use it, or it's
malfunctioning or has some sort of rounding option on it.

 

[dch3]

Depends on if the 'calculator' is actually a calculator or an adding machine.
Even though it seems that the terms are interchangable, the two function
differently as a 'calculator' is geared toward mathmeticians & scientists and
a 'adding maching' geared toward accountants & bookkeepers. Yes its all about
the math, but the difference is how the work from the user side. As the
person cited, don't use the 'calculator' to prove that the formula is
correct, do it by hand and tell the person to read their owner's manual.

 

[Hans]

Hi ,

Thanks for all your help, I will tackle this issue the the customer and
explain the fact.

Appreciate all your guidance.

Hans

 

[dch3]

By him a calculator and an adding machine and ask him to use both infront of
you. You might lose the account, but you'll prove your point.