How to mortgage hotels in Monopoly?

I am very confused on how to mortgage a hotel on a property. Do I mortgage it for half the hotel price ONLY (ie if a hotel cost 100 to install, I would receive 50 in mortgage and remove it AND the four houses), or do I count the other four house prices with it (ie if houses costs 100 x4, and the hotel cost 100, would I receive 250 in mortgage for the hotel)?

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