interest rate collars

LOS 43.c how do you determine the “D” for calculations? D is basically the number of days between each payment period. In one example it says (1 year term, quarterly): Today is July 1, next payment is October 1, January 1, April 1, July 1. The D values are 92 92 90 91 another example (2 year term, semi anual): Today is August 1, next payment is February 1, August 1, February 1, August 1 D values are 184 181 184 181

I would imagine they would always give the number of days per period in the question (I would hope!) since the allowed calcuators have no date calc functions…

I would know how many days there are in each month.