Valuation of good applying FIFO

Applying FIFO
1-4 goog purchase 90 unit @ 10
2-4 good purchase 100 unit @ 11
4-4 good sold 190 unit @ 14
6-4 good purchase 50 unit @ 9
8-4 good return by customer 20 unit
9-4 good sale 10 unit @ 14
10 unit sold from which date 2-4 , 6-4 ?