A Debt of $5000 Is to Be Paid Off by Installments

Multiple Choice

A debt of $5000 is to be paid off by installments of $2000 30-days from now,$2500 60-days from now,and a final payment of $613.68 d-days from now.If simple interest is charged at r = 12% and the declining balance method is used,what is the value of d?

A) 245
B) 240
C) 180
D) 111