A manufacturer sells a TV for $160. An online retailer sells the TV with a standard markup of 30%, and a superstore sells it with a standard markup of 40%. A) What is the price of the TV when purchased online? What is the price of the TV when purchased at the superstore?

B) What is the difference between the prices in Part (a)? How does this relate to the difference in the markup?

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.