The simple interest on a sum is 5/9 of the principal for 25 years. What is the rate (in percentage) of interest per annum?_x005F_x000D_

• A. 25/9_x005F_x000D_
• B. 9/2_x005F_x000D_
• C. 20/9_x005F_x000D_
• D. 44301