If the simple interest on a certain sum of money after 3 1⁄8 years is 1⁄4 of the principal, what is the rate of interest per annum?

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If the simple interest on a certain sum of money after 3 <span class='superscript'>1⁄</span><span class='body-subscript'></span>8 years is <span class='superscript'>1</span>⁄<span class='body-subscript'></span>4 of the principal, what is the rate of interest per annum?