| Re: Math Formula Question - Need Ideas [message #184524 is a reply to message #184523] |
Sun, 05 January 2014 18:15   |
Jerry Stuckle
Messages: 2598
Registered: September 2010
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Senior Member |
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On 1/5/2014 12:56 PM, Allodoxaphobia wrote:
> On Sat, 04 Jan 2014 19:33:31 -0500, Richard Damon wrote:
>> On 1/4/14, 7:26 PM, Adrienne Boswell wrote:
>>> I have a math question to which I can't find the answer. Here is the
>>> scenario:
>>>
>>> Someone goes to a store and has $100.00 worth of items. The merchant
>>> gives the customer a 10% discount, so only $90.00 is sent to the bank.
>>> Of the original amount, $10.00 goes to the customer for the discount,
>>> $80.00 goes to the merchant, $10.00 goes for a processing fee. But those
>>> amounts have to be calced on the original amount, not what the bank got.
>>> I need a formula to find the original amount if I have the percentage
>>> (10%) and the amount the bank got ($90.00). I know in my head that the
>>> original amount is $100.00, but I have to do it programatically.
>>>
>>> I know this is probably dead simple, but I just can't get my head around
>>> it.
>>>
>>> Thanks in advance.
>>>
>> 10% is 0.1
>>
>> You got the $90 by multiplying the original $100 by (1-0.1) to get $90,
>> so you can divide the $90 by (1 - 0.1) to get the original $100
>
> Then, state and local taxes are usually calc'd on the original price,
> not the discounted price.
>
Incorrect. State and local taxes are calculated on the actual
(discounted) selling price.
At least that's so in the United States.
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Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
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