Could you please explain how to do the following?

1. A machine cost $1,052,000on April 1, 2020. Its estimated salvage value is $138,000and its expected life is4years. What is the depreciation expense for 2021 using the double-declining balance?

2. During June, the following changes in inventory item 27 took place:

June1 Balance 1,390units@ $35

8 Sold 320units@ $71

10 Sold 1,070units@ $62

14 Purchased 810units@ $53

24 Purchased 610units@ $44

29 Sold 540units@ $67

Perpetual inventories are maintained.

What is the cost of the ending inventory for item 27 under the FIFO method?

3.