Use the following inventory information for the month of July to answer questions 30 to 32 . 30. Using the perpetual LIFO inventory method, the cost of goods sold is a. $1,660 b. $1,690 c. $1,670 d. $1,870 31. Using the perpetual FIFO inventory method, the cost of goods sold is a. $1,660 b. $1,690 c. $1,670 d. $1,870 32. Using the periodic LIFO inventory method, cost of goods sold is a. $1,660 b. $1,690 c. $1,670 d. $1,870