Accounting Questions! PLEASE HELPP!!?

1. Using the perpetual system, costing by the first-in, first-out method, what is the cost of the merchandise inventory of 30 units on November 30?

a. $610

b. $620

c. $630

d. $640

2. The number of days' sales in inventory

a. measures the length of time it takes to sell the merchandise on credit and collect the account receivable

b. measures the length of time it takes to acquire, sell, and replace the inventory

c. is about the same for all industries

d. is computed by dividing the cost of merchandise sold by 365

3. A company will most likely use an estimated method of estimating inventory when

a. the company has not kept up with their inventory records.

b. a natural disaster has destroyed most of their inventory.

c. trying to determine the amount of theft that has taken place.

d. the company decides not to do a physical inventory.

4. The inventory data for an item for November are:

Nov. 1 Inventory 20 units at $20

4 Sold 10 units

10 Purchased 30 units at $21

17 Sold 20 units

30 Purchased 10 units at $22

Using the perpetual system, costing by the first-in, first-out method, what is the cost of the merchandise inventory of 30 units on November 30?

a. $610

b. $620

c. $630

d. $640