I've tried this multiple times and get a different answer each time. Can someone help with this series of questions with an explanation?

Davis Corporation uses the weighted-average method in its process costing system. This month, the beginning inventory in the first processing department consisted of 400 units. The costs and percentage completion of these units in beginning inventory were:

Materials: Cost = $7,500, percentage complete= 75%

Conversion Costs: Cost = $4,000, percentage complete= 45%

A total of 5,400 units were started and 4,700 units were transferred to the second processing department during the month. The following costs were incurred in the first processing department during the month:

Materials costs $112,900 Conversion costs $93,900

The ending inventory was 85% complete with respect to materials and 30% complete with respect to conversion costs.

QUESTIONS:

How many units are in ending work in process inventory in the first processing department at the end of the month?

Note: Your answers may differ from those offered below due to rounding error. In all cases, select the answer that is the closest to the answer you computed. To reduce rounding error, carry out all computations to at least three decimal places.

700

2,000

900

1,100

What are the equivalent units for conversion costs for the month in the first processing department?

5,800

5,030

4,700

2,330

The cost per equivalent unit for materials for the month in the first department is closest to:

$21.37

$19.47

$20.04

$20.76