Please see question below. Thank you

(13.6 The average wage depends on ability and years of education [5] as follows: w = $50,000 + 55,0005 for more able individuals w = $30,000 + 55,0005 for less able individuals In addition, 5:10 for more able individuals and 5:5 for less able individuals. a} Do employers discriminate based on the years of education? [3 marks] b} Based on the observed difference in the average wage between more and less able individuals, what is the implied return per year of education? How is this different from the actual return per year of education? [4 marks] c) What is an instrumental variable? Explain how using an instrumental variable can help you identify the actual return per year of education even if you can't observe the ability of individuals. [3 marks]