Precious Process Proprietorship manufactures refrigerators in one department. All material costs are added at the beginning of the manufacturing process. Based on the following data, what is the total number of Equivalent Units$--$Conversion Costs produced for the month of June?

Production Data$-$Month of June

Work in process units, June $1^{st}$

Units started into production in June

Work in process units, June ${30}^{th}$

Work in process, June $30$th$,$ percent complete $($conversion costs$)$

Refrigerators

Zero Units

$20,000$ Units

$4000$ units

$19,000$ units

$24,000$ units

$23,000$ units

$20,000$ units