Callum has borrowed $300,000 from Lake Bank. He will repay $100,000 of principal at the end of each of the first three years. Callum will pay Lake Bank a variable interest rate equal to the one-year spot interest rate at the beginning of each year. Callum would like to have a fixed interest rate so he enters into an interest rate swap with Sara. Under the interest rate swap, Callum will pay a fixed rate to Sara, and Sara will pay a variable rate to Callum. The variable rate will be the same rate that Callum is paying to Lake Bank. The other characteristics of the swap will exactly match the loan that Callum has. You are given the following spot interest rates: Time (t) Spot Rate (rt) 1= 4.3% 2= 4.5% 3= 5.2% 4= 5.4% 5= 5.8% Calculate the swap interest rate for Callums swap.