To find the original price \( p \) of the shirt, you can set up the equation based on the information given:
Since $7.98 is half of the original price, you can express this as:
\[ \frac{p}{2} = 7.98 \]
To solve for \( p \), you can multiply both sides of the equation by 2:
\[ p = 7.98 \times 2 \]
Calculating that gives:
\[ p = 15.96 \]
So, the original price \( p \) of the shirt is $15.96.