Given the following information and assuming beginning inventory was zero what is the gross profit at the end of the period using the FIFO, LIFO, and average cost methods
| Purchases | Sales |
| 20 units at $ 50 | 15 units at $ 60 |
| 35 units at $ 40 | 35 units at $ 45 |
| 85 units at $ 30 | 85 units at $ 35 |
FIFO LIFO Cost Average ①A. $ 650 $ 750 $ 990
②B. $ 650 $ 750 $ 677
③C. $ 677 $ 650 $ 677
（）
A．①
B．②
C．③