Rachel created 215 pairs of earrings. Materials for the earrings were $0.25 a pair. At a craft fair Rachel sells all 215 pairs of earrings and ends up with $ 3272.30. After factoring out the cost of materials, how much money did Rachel make on 1 pair of earrings?

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.