Top Corp uses LIFO accounting for inventory. Top begins the first quarter of 2020 with 800 units with a cost $60 each. During the first quarter of 2020, Top purchases 300 units at $70 each and sells 400 units at $130 each.

At March 31, 2018, replacement cost for inventory is $90 a unit. Top expects to replace all 400 units that it sold by end of 2020.

Using the integral method, what is the amount of Cost of Goods Sold recorded by Top for the quarter ended March 31,2020

a. $24,000

b. $28,000

c. $21,000

d. $30,000

e. $52,000