The Bally company operates the water bottling process (no losses are incurred). In January, there was no opening work-in-progress; the ending work in progress was complete to the same degree for all elements of cost.

The process account for January was as follows:

Finished output (7,000 units) $490,000

Ending work-in-progress (4,000 units) $140,000

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Total cost $630,000

What was the percentage degree of completion of the ending work-in-progress? Show your calculations.

A 12%

B 30%

C 50%

D 75%