Choice A is the correct answer. Set equations equal.

1. Eq A: $C = 20h + 50$.
2. Eq B: $C = 30h + 10$.
3. Equate: $20h + 50 = 30h + 10$.
4. Solve: Subtract $20h \rightarrow 50 = 10h + 10$. Subtract $10 \rightarrow 40 = 10h$. Divide by 10 $\rightarrow h = 4$.

💡 Strategic Tip: The intersection point is the break-even point.

Choice B is incorrect.Choice C is incorrect.Choice D is incorrect.