Joseph borrowed an amount of P512,390 and promise to pay every year for 5 years. He paid a fixed amount at the end of first year and the succeeding payments are P980 more than the previous payment. If...

Joseph borrowed an amount of P512,390 and promise to pay every year for 5 years. He paid a fixed amount at the end of first year and the succeeding payments are P980 more than the previous payment. If the interest rate is 11.622% compounded quarterly, determine the following: 1.Interest rate per month,%? 2.Amount paid at the end of 3 years. 3.Amount to be paid at the end of 5 years, if he failed to pay the amount at the end of 3rd and 4th year. 4 Amount paid at the end of 3 years. 5.Amount to be paid at the end of 5 years, if he failed to pay the amount at the end of 3rd and 4th year.