| 10. | INVENTORIES |
| December 31 | ||||||||||||
| 2016 | 2017 | |||||||||||
| NT$ | NT$ | US$ (Note 4) | ||||||||||
| Finished goods | $ | 6,519,465 | $ | 6,740,816 | $ | 227,423 | ||||||
| Work in process | 2,822,687 | 3,452,332 | 116,475 | |||||||||
| Raw materials | 10,850,062 | 12,625,502 | 425,962 | |||||||||
| Supplies | 795,093 | 894,196 | 30,168 | |||||||||
| Raw materials and supplies in transit | 450,755 | 548,065 | 18,491 | |||||||||
| $ | 21,438,062 | $ | 24,260,911 | $ | 818,519 | |||||||
The cost of inventories recognized as operating costs for the years ended December 31, 2015, 2016 and 2017 were NT$233,165,722 thousand, NT$219,630,270 thousand (retrospectively adjusted) and NT$237,193,286 thousand (US$8,002,473 thousand), respectively, which included write-downs of inventories at NT$352,011 thousand, NT$451,780 thousand and NT$398,824 thousand (US$13,456 thousand), respectively.