How to calc IRR on short position?

Hi guys,

Dumb question but as title suggests. How do you calculate IRRs on a short position? Say you sell short at $100 and cover at $50 in year 3. What is the IRR of this trade? 
Given this is a positive inflow upfront then negative outflow at cover, excel doesn’t seem to be able to calculate IRR. If IRR is not the right way to frame this, how do you evaluate individual short position returns?

 

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