Fixed extraction machines produce as follows:
Power miner 01 = extraction 12% of the cost
Power miner 02 = extraction 10.8% of the cost
Power miner 04 = extraction 9.6% of the cost
Power miner 08 = extraction 8.4% of the cost
Power miner 16 = extraction 7.2% of the cost
Power miner 32 = extraction 6% of the cost
At the end of the rental credited the full amount of the rental made.