Called a "discount".
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According to how I read the section in the related link, the cash discount can be deducted from the amount of the sale, and the discounted sale price is recorded.
It is called a discount, and is normally a percentage of the regular sales price.
8.5% of $20,000 is 8.5 x $20,000 / 100 or $1,700, so the total price would be $21,700
The amount of tax divided by the percent of tax (expressed as a decimal) will equal the original price.
discount is an amount deducted from the usual list price