Please answer the following question while clearly showing the equation and variables used to solve it$.$ Thank you!

The following information pertains to the Don Company:

Materials are added at the beginning of the process. If equivalent units in process for conversion using the weighted average method were $20,000,$ ending work$-$in$-$process at April $30$ was

Select one:

A$.15\mathrm{.}0$ percent complete.

B$.31\mathrm{.}7$ percent complete

C$.32\mathrm{.}5$ percent complete

D$.25\mathrm{.}0$ percent complete.