Just to clarify a little: If your efficiency increases by 10% you get 10% more output. With a current efficiency of 10%, increasing it 10% would mean your now

Just to clarify a little: If your efficiency increases by 10% you get 10% more output. With a current efficiency of 10%, increasing it 10% would mean your now at 11% efficiency. If we talk about an increase of 10 percentage points, we end up with with 20% efficiency effectively doubling the output (100% increase).