By default, the IDC rates should be displayed separately.
1 month at 58%: 10,549 DC + 6,118 IDC = 16,667
11 months at 59%: 115,304 DC + 68,029 IDC = 183,333
In instances where only a single IDC rate can be listed, the IDC can be calculated via a weighted average. See below example:
Annual IDC rate calculation: (58*1 + 59*11)/12 = 58.92
200,000/1.5892 = 125,849 DC and 74,151 IDC