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

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 , then the dollars discounted are

And the final price is

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

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

answer: a

step-by-step explanation:

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents