I fully understand the concepts of LIFO & FIFO. However, it takes me a long time to do my calculations and reach the answer. So, I'm looking for a more efficient way to carry out the calculations (just how *you* might do it is good enough...I don't need perfection).

Quench, a bottled water supplier, has 5,496 bottles of water in their warehouse at the end of April. One- third of the bottles were purchased in February at a cost of $1.00 per bottle. Another third were purchased in the month of March at a cost of $1.25 per bottle. The remaining third were purchased in April at a cost of $1.75 per bottle. The warehouse sold and shipped 4,925 bottles during May. Quench uses FIFO to value their inventory. What was the Cost of Sales related to the bottles shipped in May? $7,328.00 $6,328.75 V $6,756.00 $6,870.00 Correct