Edward borrowed an amount to his friend and promised to pay the principal amount and accumulated interest within 8 years at a simple interest rate of 15.118%. As what was agreed upon, Edward must pay...

Edward borrowed an amount to his friend and promised to pay the principal amount and accumulated interest within 8 years at a simple interest rate of 15.118%. As what was agreed upon, Edward must pay two separate payments, one at the end of 3 years with an amount equivalent to half of the loan and the interest accumulated for the first 3 years, and a final payment at the end of 8 years. If he paid a total amount of P15.855 on his first payment, determine the following: Determine the total principal amount borrowed. Amount paid at the end of 8 years. Accumulated interest at the end of 3 years.