Buckle Company is considering different depreciation methods that should be applied to its factory equipment. Depreciation expense for five years using different methods are presented below:

Year	Straight-Line	Double-Declining	Sum-of-the-Years Digit
1	70,000	160,000	116,667
2	70,000	96,000	93,333
3	70,000	57,600	70,000
4	70,000	34,560	46,667
5	70,000	1,840	23,333

How much is the estimated residual value?

	a.	0
	b.	Php 25,000
	c.	Php 50,000