with solution please

How much money must you invest today in order to withdraw P 19,596 annually for6 years of the interest rate is 4.48%? Money borrowed today is to be paid in 9 equal payments at the beginning of each quarter. If the interest is 2% compounded quarterly, how much was initially borrowed if quarterly payment is P 20,160 if payments are done every beginning of the month? A gasoline engine is available on instalment basis with a down payment of P 11,652 and P 16,027 at the end of each month for one year. What is the cash price of the engine if interest is set at 8.28% compounded monthly