Tequila Mockingbird, Inc.$\text{'}$s inventory activity in September was as follows:

$\backslash$table$[[,$$$/$Unit$,$Quantity$],[$Inventory$,$ September $1,6,12],[$Purchase$,$ September $12,11,16],[$Goods Available for Sale,,$15],[$Sale$,$ September $25,18,15]]$

Calculate the Cost of Goods Sold using FIFO perpetual.