有谁能帮我解答一下的问题吗？？紧急的需要：
1）The Widget Company buys a new asset for X. It is expected to last 20 years and has a salvage value of $700. The company initially decides to depreciate the asset by sum-of-the-digits method. However, after five years, the company changes to the straight-line method. At the end of 13 years, the depreciated value of the asset is 1540. Calculate X.
2）
The Robins Company buys a new machine, which will be depreciated over a 10-year period. The purchase price is $6,000, and the salvage value at the end of 10 years is $500. Using an annual effective interest rate of i, you are given:
i.
Th present value of all depreciation charges using the straight-line method is $3,107.50
ii.
Th present value of all depreciation charges using the sum-of-the-digits method is $3,625.00
Determine i.
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