A carpenter designed the top of a table in a triangular shape as shown below. Determine the difference between the largest and the smallest angles in the figure above.

Set up an equation with the given angles.

First angle: $n - 30^\circ = 50^\circ - 30^\circ = 20^\circ$
Second angle: $n^\circ = 50^\circ$
Third angle: $2n + 10^\circ = 2(50^\circ) + 10^\circ = 100^\circ + 10^\circ = 110^\circ$

The angles are $20^\circ$, $50^\circ$, and $110^\circ$.
Largest angle = $110^\circ$
Smallest angle = $20^\circ$
Difference = Largest angle - Smallest angle
Difference = $110^\circ - 20^\circ = 90^\circ$

The difference between the largest and the smallest angles is $\boxed{90^\circ}$.