Question

Johnny got 20% discount at a sale. He got a new shirt for $12. What was the original price of the shirt?

Answer 1

$12 is the price of the shirt after 20% discount.

So, if we let the original price of the shirt be x, we can say:

What number (x), decreased by 20% gives us 12??

Or,

x - 20% of x = 12

We need to convert the percentage to a decimal by dividing by 100. So, 20/100 = 0.2

Now, we can write

`x-0.2x=12`

With a little algebra, we can solve for x, the original price. Shown below:

`\begin{gathered} x-0.2x=12 \\ 0.8x=12 \\ x=(12)/(0.8) \\ x=15 \end{gathered}`

The original price of the shirt

$15