Amy and Bob have a company that bought a new machine worth $400,000. Of this sum, $50,000 is the installation cost. They are debating how to treat the depreciation associated with the installation cost.

Amy wants to treat this cost as a tax deductible expense at the end of year 1 whereas Bob treats the cost as a capital investment, by depreciating the $50,000 straight line over five years. Say the tax rate is 25%, and the opportunity cost of capital is 6.6%. All else equal, what would eb the difference in NPV between Amy's method and Bob's method?