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4 (10 pts} SHGJ Enterprises has asked you to look at the following data that includes marginal costs of the existing asset and equal uniform annual costs (EUAC) of the new asset if kept for n years: Year, n Marginal Cost Data Existing Asset EUAC if Kept n Years New Asset 1 $5000 $8000 2 $5150 $6500 3 $5800 $6300 4 $6000 $6100 5 $6150 $6150 6 $6500 $6400 [GJWhat is the new asset's economic life? [b]When, if at all, should we replace the existing asset with the new asset