A company uses process costing to establish the cost per unit of its output. The following information was available for the last month:

Input units

10 000

Output units

9850

Opening stock

300 units, 100% complete for materials and 70% complete for conversion costs

Closing stock

450 units, 100% complete for materials and 30% complete for conversion costs

The company uses the weighted average method of valuing stock.

What were the equivalent units for conversion costs?

A 9505 units

B 9717 units

C 9775 units

D 9985 units