I went through step by step how to do the problem I mentioned in the subject of

Question

I went through step by step how to do the problem I mentioned in the subject of this question, but got stuck in step #2.
The question is:
An electric scooter has a battery capable of supplying 120Wh of energy. If frictional forces and other losses account for 60.0% of the energy usage what change in altitude can a rider achieve when driving in hilly terrain if the rider and scooter have a combined weight of 890N?

I just don't understand which formula was used in step #2. I can't find any formula similar to the one they gave in my book...
Thanks!

Explanation / Answer

Energy conversion efficiency, desired energy output per energy input 

Efficiency is e = (energy output)/(energy input)

                  0.4 = mgh/(432000J) 

                   (0.4) = (890 N)h/(432000 J)

 Solve for h.

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