4) A certain amount was borrowed from a bank at 9% compounded semiannually for three years. At the end of the loan period P65,113.01 was paid back. What amount was originally borrowed? 5) A businessman borrowed P50,000 from a bank. The interest was compounded semiannually for three years. At the end of the loan period, the businessman paid back P63,265.95. what was the nominal rate? 6) An amount of 20,000 was borrowed at 12% compounded semiannually. At the end of the loan period, P28,370.38 was paid back. What was the number of interest periods and the number of years