During $2024,$ a company sells $20$ units of inventory. The company has the following inventory purchase transactions for $2024$ :

$\backslash$table$[[$Date$,$Transaction,$\backslash$table$[[$Number of$],[$Units$]],\backslash$table$[[$Unit$],[$Cost$]],\backslash$table$[[$Total$],[$Cost$]]],[$January $1,$Beginning inventory,$15,$$$60,$$$900$