To solve the equation \( \frac{n}{12.4} = -4 \), you want to isolate \( n \).
You can do this by multiplying both sides of the equation by \( 12.4 \):
\[ n = -4 \times 12.4 \]
Now, calculate the right side:
\[ n = -49.6 \]
So, the solution is:
\[ n = -49.6 \]