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You don't. Such an efficiency can be less than 1, but it can't be greater than 1.
It is always less than 1 or 100%.It is always less than 1 or 100%.It is always less than 1 or 100%.It is always less than 1 or 100%.
It tells me that the machine is imaginary and does not exist.
Efficiency as a percent is output/input * 100%12000/15000 * 100% = 80% efficiency which makes sense, because it takes more work (input) than it give out (output). So the efficiency should be less than 100%.
No. That would violate Conservation of Energy, so it follows that it isn't possible.