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An investor was afraid that he would become like King Lear in his retirement and beg hospitality from his children, so he purchased

grain "tithes," or shares in farm output, for $760$ pounds. The tithes paid him $76$ pounds per year for $32$ years. What interest rate did the

he receive on this investment?

Note: Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$