12.

INVENTORIES

	December 31
	2017		2018
	NT$		NT$		US$ (Note 4)

Finished goods	$	6,740,816	$	7,680,083	$	250,901
Work in process		3,452,332		3,195,478		104,393
Raw materials		12,625,502		23,250,801		759,582
Supplies		894,196		1,892,194		61,816
Raw materials and supplies in transit		548,065		608,895		19,892
	$	24,260,911	$	36,627,451	$	1,196,584

The cost of inventories recognized as operating costs for the years ended December 31, 2016, 2017 and 2018 were NT$219,630,270 thousand, NT$237,193,286 thousand and NT$309,020,850 thousand (US$10,095,421 thousand), respectively, which included write-downs of inventories at NT$451,780 thousand, NT$398,824 thousand and NT$980,927 thousand (US$32,046 thousand), respectively.