To calculate the discounted price of a CD given the marked price \( p \), we first need to determine what 23% off means in terms of price.
- The discount is calculated as \( 0.23p \), which represents 23% of the marked price \( p \).
- To find the discounted price, we subtract the discount from the marked price:
\[ \text{Discounted Price} = p - \text{Discount} = p - 0.23p \]
This simplifies to:
\[ \text{Discounted Price} = p(1 - 0.23) = p(0.77) \]
However, you are only looking for an expression for the discount itself, which is:
\[ 0.23p \]
So the correct expression that you would use in your calculator to find the discount amount based on a marked price of \( p \) dollars is:
0.23p (This represents the amount of discount).