How can I subtract a percentage?

Is there a way to subtract percentages? Here is an example of
what I need to do: 138 - 5% = 131.1
Some of what I have is...
<cfset HDQty = 6>
<cfset HDSAmplePrice = #getSamplePrice.HDPrice#>
<cfset HDSubTotal = #HDQty# * #HDSAmplePrice#>
<cfset HDDiscount = #getDiscount.DiscountAmt#>
This is where I don't know what to do, obviously if I just
subtract the discount it minuses 5 not 5%
<cfset HDTotal = #HDSubTotal# - #HDDiscount #>
Any and all help is greatly appreciated!!!

quote:
Originally posted by:
ICSchaef
Is there a way to subtract percentages? Here is an example of
what I need to do: 138 - 5% = 131.1
Any and all help is greatly appreciated!!!
Write it out manually first.
138 - (138 * .05)
Then convert it to code.

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