Final answer:
The initial fee charged by Yak travel agency for climbing Mount Everest is $120.
Step-by-step explanation:
To find the initial fee charged by Yak travel agency for climbing Mount Everest, we can use the given information. The price for climbing all the way to the summit, which is 3500 meters above the base of the mountain, is $645. The agency charges an additional fee of $0.15 for each vertical meter climbed. Therefore, we can subtract the additional fee from the total price to find the initial fee. Additional fee = 3500 meters * $0.15 = $525
Initial fee = Total price - Additional fee = $645 - $525 = $120
Therefore, the initial fee charged by Yak travel agency for climbing Mount Everest is $120. Option 1) $450 is not correct.