A sum will be double itself at a simple interest p.a. in 8 years. The simple interest is June 20, 2021 by admin Question: A sum will be double itself at a simple interest p.a. in 8 years. The simple interest is A. 10% B. 10.5% C. 12% D. 12.5% Answer» d. 12.5% Note: The above multiple-choice question is for all general and Competitive Exams in India.