Buck converter ripple: PE Power Power Electronics practice question

A substation control house needs 24 V dc for a new RTU panel. It is supplied from the station's 125 V dc battery through a buck (step-down) converter that switches at 50 kHz with a 330 µH output inductor. The panel draws 5 A. Treating the switch and diode as ideal and the converter as operating in continuous conduction, the peak-to-peak ripple of the inductor current is most nearly: