Your university is constructing a beautiful new building on your campus at a cost of $$20$ million, and the building is estimated to last for $50$ years, at which time the building will be rebuilt at the same cost. Annual maintenance costs of the building will be $$200,000.$ The benefactor who donated the cost of the building will also fund a separate endowment of $$8,275,100$ that will pay maintenance costs each year plus rebuilding costs each $50$ years, in perpetuity. What interest rate does the endowment pay? Select the closest answer.