Question

If the regular price of an item is X dollars, what is the discount price in dollars?

Answer 1

First, we have to know the discount percentage.

Let's say that is 20% off, this would be in decimal number 0.20.

Now, if the regular price is
`\$X`, then the dollars discounted are

`(0.20)(\$X)`

And the final price is

`\$X-\$0.20X=\$0.80X`

Which means that the final price is 80% of the regular prices.

Now, for a general case, let's call
`Y\%` the percentage discount, in this case, the final price would be

`\$X-\$(0.Y)X=\$(1-0.Y)X`