Today, everything at a store is on sale. the store offers a 20% discount. the regular price of a shirt is x dollars, what is the discount price in dollars?

original cost - (percentage off)(original cost) = sale cost

x - 0.35x = 0.65x = sale cost Remember that x = 1x.  

x - 0.35x = 1x - 0.35x = 0.65x

Step-by-step explanation:

et me give you another problem and see if you can figure it out.  A shirt is x dollars and it's on sale for 20% off.

Let's think about how you would figure this out in the store and turn it into an equation.

You take the original amount, multiply it by 20%, and subtract it from the original amount.

Remember that to turn a percent into a decimal, we move the decimal 2 places to the left,

So, we have x - .20x = the new price.

Now, remember that the old price is 100%, right?  What percent is the new price if we took 20% off?  80%, right?

So, we can either subtract x - .20x to get .80x, or we can take the 20% from the 100% to get the 80%, or .80x.

the circle one