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Securenode calculator
https://zen.lebre.net/ - soon this percentage will be changed in to the 10%! Please read white paper.
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Either this calculator is broke or I am missing something embarrassingly obvious because when I tried inputting 1 secure node at a USD price for ZEN of $40 and a cost to run the VPS of $5US I get a monthly reward of 7560 ZEN...
More about where to host your Secure Node (VPS recommendations and experiences - VPS price)