Interest computations based only on the original principal. For example, the simple interest on a $100,000, 8% loan is $8,000. It is compared with compound interest which is applied to the original principal and accumulated interest. For example, $100 deposited in a savings account at 10% simple interest would yield the interest of $10 per year (10% of $100). The same $100 at 10% interest compounded annually would yield $10 interest in the first year. In the second year, however, the interest will be $12,10 (10% of $110, the first year's principal and interest).