Weight difference at Mt. Everest summit vs. sea level

[pauladancer]

Homework Statement

Ned climbs to the peak of Mt. Everest, the tallest peak on Earth at 8850 m above sea level. Ned's mass is 95 kg, the mass of Earth is 5.98 x 1024 kg, and Earth's radius is 6.37 x 106 m. What is the difference in Ned's weight when comparing his weight at the top of the mountain to his weight at sea level?

Homework Equations

Fg = Gm1m2 / r²
g = Gm / r²
g = Fg / m

The Attempt at a Solution

I think I have the field strength equal to 9.80 N using the equation g = Gm / r² . After that I'm lost, I have no idea how to get his weight at the top of the mountain!

 

[pauladancer]

Sorry, mass of Earth should be 5.98 x 10²⁴kg and radius of Earth should be 6.37 x 10⁶m

 

[haruspex]

I have no idea how to get his weight at the top of the mountain!

Same formula, but are all the variables in it the same value?