help plz

person he time so as apenalty problem 2: A borrowed JD50,000 which will repaid at 20 successive equal annual installment at an annual intrest rate of 15% If he paid the first 12 installments on time of he didn't paid the next three installments [13, 14, 15, 16] on have to pay the remaining amount in the period [16-20] Calculate the value of the new installments if he repaid the remaining amount in the dates they agreed upon