Answer:
$8150
Explanation:
As the perpetual inventory system used for determining the Cost of Goods Sold is LIFO (lastminus-in, firstminus-out), we should consider that the first goods sold are the ones purchased last. So, from the total of 175 units sold, 115 are the ones purchased later (at a $50 cost) and 60 belong to the units purchased first (at $40 cost).
So to determine the total Cost of Goods Sold is 50*115+60*40= $8150