1. Which of the following situations shows compound interest? A. An amount of P100 with 10% interest rate gained an interest of P20 for two years. B. An amount of P100 with 10% interest rate earned P10 on its first year and earned P11 on the second year. C. An amount of P100 with 10% interest rate earned P10 for the first year and gained P10 on the second year. D. None of these