http://www.robinsonheli.com/R44EOC.pdf
for robinson DOC
Equivalent bell approx 210 USD /hr as compared to approx 105 /hr . ( 124 less 18.88 fixed cost)
Major element is engine cost 54/ hr for bell 9.55/ hr for robby.
If that was taken out of equation then 25% would not be that far out.
Neil