What is the balance in Work in Process Inventory at the end of each month?

Work in Process InventoryOriole Company begins operations on April $1.$ Information from job cost sheets shows the following.

Job $12$ was completed in April. Job $10$ was completed in May. Jobs $11$ and $13$ were completed in June. Each job was sold for $25\%$ above

its cost in the month following completion.

$($a$)$

What is the balance in Work in Process Inventory at the end of each month?