Oh c'mon people! I've asked this thrice now! It's a damn Physics problem that I freakin' need help with!!!!

The elevation at the base of a ski hill is 350m above sea level. A ski lift raises a skier (total mass=72Kg, including equipment) to the top of the hill. If the skier's gravitational potential energy relative to the base of the hill is now 9.2x10^5 J, what is the elevation at the top of the hill?


This is the THIRD time I ask this question... I'm doing my homework and I'm stuck at this damn problem! Please help me do it - it's driving me crazy!!!!!!!!!

GPE = 920,000N.
Now that figure is the additional GPE from the hill.
GPE = MGH.
MG = 72 x 9.8, = 705.6N.
MGH = 705.6 x 350, = 246,960 joules GPE for the 350m.
(920,000 - 246,960) = added 673,040 joules for the ski hill.
(673,040/705.6) = hill height of 953.85 metres.