At the end of 20x1, Harper & Closk company has 50,000 of taxable temporary differences. Reports taxable income of 90,000 at the end of 20x1. The enacted tax rates are: 20x1 - 23%, 20x2-20x5 - 35%, 2016 - 34 % and years later is enacted for 45%. What is the appropriate tax rate to measure the deferred tax liability at the end of 20x1? Could you also explain why we would or would not have to take the average of these rates?