Find the cost of goods sold if sales total $$78,857$ for the inventory table shown below.

$\backslash$table$[[$Date of purchase,$\backslash$table$[[$Units$],[$purchased$]],\backslash$table$[[$Cost per$],[$unit$]],\backslash$table$[[$Total$],[$cost$]],\backslash$table$[[$Retail price$],[$per unit$]],\backslash$table$[[$Total retail$],[$value$]]],[$Beginning inventory,$41,$$$860,$$$35,260,$$$985,$$$40,385$