An investor was afraid that he would become like King Lear in his notirement and beg hospitaity from his children, so he purchased grain Tithes or shares in farm output, for 480 pounds. The tithes paid him 61 pounds per year for 32 years. What interest rate did the he receive on this investment? (Do not round intermediate calculations and enter your answer as a parcent rounded to 2 decimal places, .9.32.16.) Inberest rate