Choice D is the correct answer. Multiple equivalent forms can represent the same constraint.

1. Choice A: Net rate is $(80-15)=65$ per hour, times 8 hours: $65 \times 8 = 520$ ??n2. Choice B: Total revenue minus total costs: $80(8) - 15(8) = 640 - 120 = 520$ ??n3. Choice C: This is also correct since $520 \geq 520$, but D is more complete
2. Both A and B equal 520, satisfying the $\geq 520$ requirement

?�� Strategic Tip: Net earnings equal gross income minus expenses, calculated either as (rate per unit) × (quantity) or total revenue - total costs.

Choice A alone is incomplete because while true, choice D recognizes both forms are valid. Choice B alone is incomplete because while true, choice D recognizes both forms are valid. Choice C is incomplete as the only answer because while they do meet the goal exactly, the question asks which statement is true, making D the best answer.