You investe an amount of P50,000 with a promised interest of 9% compounded quarterly. How many years will it take for the money to become twice the original amount? What is the effective interest...

You investe an amount of P50,000 with a promised interest of 9% compounded quarterly. How many years will it take for the money to become twice the original amount? What is the effective interest rate? Taking into consideration the inflation rate which is 6%, what is the actual purchasing power of your investment by the time you choose to withdraw it?