Please answer the following question:

Question 1: The pension plan also invests in physical assets. It is considering the purchase of an office building today. What is the annual yield (internal rate of return) of the investment if the purchase price is $12,000,000 today and the sale price 6 years later is $20,400,000? Answer should be a number given as a %. That is, for example 3.18% should be answered as 3.18 rather than 3.18% or 0.0318